The present invention relates to a packaging system and corrugated cardboard packaging box with inserts used for shipping goods. Specifically, the invention relates to a set of components used in a corrugated cardboard box that compartmentalize the box into weight bearing compartments, thus allowing for the simultaneous packaging within the box of items having disparate shapes, sizes, and density. This creates a unique ability to ship light and fragile products with heavy products.
Retail online purchasing by consumers has exploded over recent years. Consumer goods of all types can now be ordered online and shipped directly to the consumer. The means for shipping such product is typically a corrugated box in which the product ordered is placed, along with dunnage (such as filler paper, plastic bubble wrap, styrofoam pieces, etc.), which is used to protect the product from damage during shipping. Shipping product in this way, in a corrugated box with dunnage, is adequate for most packaging solutions. However, an emerging retail grocery market available through online ordering and delivery to the consumer presents challenges to this standard shipping method. Specifically, consumers have begun to order grocery items online through outlets such as Amazon's PrimePantry™ and Walmart.com.
The model of offering grocery items to a consumer through online sale and shipped delivery poses unique challenges and problems. Many grocery items don't combine well in a single box. Yet, the model for retail online grocery services requires that all items be shipped in as few boxes as possible in order to limit shipping cost. In fact, some models for online grocery shopping limit the consumer to the filling of a single box per order based on the weight and cubic size of the order. Consequently, any packaging used to support this model must provide protection for products of disparate shape, size, weight, and density, as is typical of a grocery order.
For example, a single order from a consumer may include canned goods, various boxes and bottles, various bagged goods such as bread products and flexible pillow bags with crushable contents such as potato chips. The problems faced in this situation can be understood when imaging a box filled with heavy canned goods combined with several pillow bags holding potato chips and tortilla chips. While packing this box, the best protection that can be provided under current practices is to place all the heavier items (the canned goods) at the bottom of the box and the lighter items (the pillow bags) at the top of the box. Some dunnage can be added to provide some extra protection. However, unless the box maintains the same orientation throughout the entire shipping process, the heavier items on the bottom of the box will at some point crush the pillow bags placed at the top of the box. This usually results in rupturing of the bags and crushing of the food product found within the pillow bags.
A prior art alternative to a corrugated box with dunnage involves a corrugated box with a modular product protection system comprising one or more vertical compartmented inserts. This compartmented insert is illustrated in
The insert is deployed by first forming the flat insert shown in
Also shown in
The final deployment of the vertical compartmented insert is illustrated in
This deployed compartmented insert is of such dimension as to nest in a companion corrugated box 190 such as the one illustrated in
This prior art solution of a compartmented container using a compartmented insert nested in a corrugated box is an improvement over the prior art method of packaging a corrugated box with product protected by dunnage. However, the prior art usage of a compartmented insert does not provide the flexibility that an open box with dunnage provides in accommodating product of various sizes and shapes. Further, the prior art design adds considerable corrugated material to a shipping container thus adding to the cost and weight of the container.
Consequently, a packaging system using a corrugated cardboard box as the outer shell is needed that provides both separation of product like a compartmented insert system provides as well as the ability to configure the interior of the box to accommodate products of varying shapes and sizes. This packaging solution should allow for quick and simple construction using common components. This packaging solution should provide protection for product within a corrugated cardboard box wherein the product consists of individual items of various sizes, shapes, and density, while minimizing the amount of corrugated cardboard material added to the container.
The present invention is of a packaging system that includes a corrugated cardboard box with components inside the corrugated cardboard box that divide the interior of the box into various compartments. Moreover, the double layered (also referred to as “back-to-back”) construction creates a stronger packaging system that is more resistant to externally applied crush forces. The long support insert, when deployed in the container, has side panels at each end in a T-formation such that each side panel has an outboard edge that abuts against a longitudinal side wall, while the flat outer surface of the side panels urge against an opposed lateral wall. This structural arrangement imparts improved strength and rigidity to the compartmentalized box.
In an exemplary embodiment, the invention provides a corrugated cardboard box having a vertical compartmented insert nested within the corrugated cardboard box. The vertical compartmented insert includes a rectangular vertical array of interior dividing walls forming there between a plurality of rectangular compartments, each having a storage volume. The compartmented insert includes a pair of back-to-back support inserts extending along a length of the corrugated cardboard box to form a longitudinal wall, each one of the pair of long support inserts have a plurality of interlocking cutouts each of which registers with a respective interlocking cutout of the other one of the pair of long support inserts. The compartmented insert also comprises a plurality of pairs of short support inserts, the pairs of short support inserts are assembled back-to-back and arrayed perpendicularly to the pair of long support inserts to form a plurality of lateral walls extending across the inside of the box. Each of the plurality of pairs of back-to-back short support insert assemblies have interlocking cutouts that register to form a common cutout in each back-to-back assembly. The interlocking cutouts of the pairs of back-to-back short support inserts registers with and mechanically locks with corresponding interlocking cutouts of the back-to-back long support inserts. As a result, the pair of long support inserts and the plurality of back-to-back short support inserts create the plurality of rectangular compartments there between.
Each of the pair of long support inserts has a middle panel flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back long support inserts extend outboard in opposite directions at right angles to the middle panel, abut flush against, and urge against a first interior wall surface of the corrugated box, and the second side panels of each of the back-to-back long support inserts extend outward in opposite directions at right angles to the middle panel, abut flush against, and urge against a second interior wall surface, opposite to the first interior wall surface, of the corrugated box. Also, each of the plurality of back-to-back assemblies of short support inserts includes a middle panel, flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back short support inserts extend outboard in opposite directions at right angles to said middle panel, abut flush against, and urge against a third interior wall surface of the corrugated box, and the second side panels of each of the back-to-back short support inserts extend outward in opposite directions at right angles to said middle panel, abut flush against, and urge against a fourth wall surface, opposite to the third interior wall surface of the corrugated box.
Further, in the exemplary embodiment, the long support insert and the plurality of short support inserts may each be comprised of cardboard material. The corrugations may be arrayed vertically in the rectangular vertical array of interior dividing walls.
Also, in an exemplary embodiment, a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back long support inserts may be equal to a width of a respective interior wall against which the side panels abut. Such a configuration directs externally applied force to the first and second walls to the back-to-back middle panels of the long support inserts thereby increasing structural rigidity of the corrugated cardboard box.
In another exemplary embodiment, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back short support inserts is less than a width of respective interior walls against which the side panels abut, and such a configuration may direct externally applied force to the third and fourth walls to the back-to-back middle panels of the short support inserts thereby increasing structural rigidity of the corrugated cardboard box.
Additionally, the long support insert can include a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, that each extend outward in the same direction at right angles to the middle panel.
Further, each of the pair of back-to-back long support inserts can include a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, such that the back-to-back pair of long support insert has at each end two side panels extending outward in opposite directions.
In an exemplary embodiment, each of the plurality of pairs of back-to-back assembled short support insert can include a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the short support insert into a middle panel flanked by a first and a second side panel, such that each of the plurality of back-to-back assembled pairs of short support inserts has at each end two side panels extending outward in opposite directions.
The invention therefore provides a packaging system using a corrugated cardboard box as the outer shell that provides both separation of product while also providing the ability to easily configure the interior of the box to accommodate products with varying shapes and sizes. Further, on account of the “double-layered” (also referred to as back-to-back) support inserts used in accordance with exemplary embodiments, and the side panels of the support inserts, the compartmentalized containers have greater resistance to externally-applied crush forces on the container, from the sides, or from above and below. The invention provides a packaging solution that allows for quick and simple construction. Further, the invention also provides a packaging solution that protects products within a corrugated cardboard box wherein the products consist of individual items of various sizes, shapes, and density.
Using the invention, the interior of a box can be easily and quickly configured to contain a number of different sized compartments or cells, each of which provides load bearing capabilities independent from other compartments in the box, which minimizes the amount of corrugated cardboard material added to the container.
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will be best understood from the Detailed Description, here below, with reference to the following illustrations of exemplary non-limiting embodiments, wherein:
The following non-limiting detailed descriptions of examples of embodiments of the invention may refer to appended Figure drawings and are not limited to the drawings, which are merely presented for enhancing explanations of features of the technology. In addition, the detailed descriptions may refer to particular terms of art, some of which are defined herein, as appropriate and necessary for clarity. It will be understood by those skilled in the art that various changes, in form and detail may be made therein without departing from the spirit and scope of the invention, as disclosed and claimed herein.
The container-compartmentalization embodiments and methods described herein provide many advantages over the prior art. As will become clear, the embodiments utilize less materials for a compartmentalized container of comparable size and number of compartments in the prior art. This results in a lighter, stronger compartmentalized box, while reducing costs of manufacture, and reducing weight to be transported resulting in fuel savings. Moreover, with less material being used, there is less material to recycle, so that environmental benefits may be expected. Further, on account of the “double-layered” support inserts used in accordance with exemplary embodiments, and the side panels of the support inserts that extend across an entire width of the interior of the box, the compartmentalized containers have greater resistance to externally-applied crush forces on the container, from the sides, or from above and below. The double layered short support inserts are also effective in improving both strength and rigidity of the compartmentalized box.
The system of “double-layered” support inserts (both the long as well as the short inserts are double-layered, as explained in more detail here below) presented herein provide improved strength in resistance to applied forces, and allow the packer with a great deal of flexibility. For example, the side panels of the long support inserts extend across the entire lateral width of the container and urge against the wall against which it abuts to provide structural strength. Thus, these divide the box into two sections, one on either side of the long support insert. Conventionally, herein, the “long support insert” extends along the length of the box, and is said to extend “longitudinally,” even when the box is square.)
In addition, it can be readily seen that since the side panels of the short support inserts do not extend across an entire length of the container, once installed, the short support insert can slide internally along the length of the container to thereby divide the container volume into two volumes (compartments) of varying relative size. Conventionally, herein, the “short support insert” extends along the width of the box, and is said to extend “laterally.”)
Further, the number of compartments per container can be varied by judicious selection of the number of interlocking cutouts per long support insert. And, the sizes of the compartments can be varied, based on the spacing between interlocking cutouts. Thus, the system provides for wide variation in sizes of items to be packaged in a compartmented fashion.
The system can be configured for use in virtually any size of box. The system can be configured as a “retrofit” to boxes used in a variety of functions, including e-commerce order fulfillment.
In addition, while the illustrations indicate, for simplicity, compartments of equal size, of course, changing the spacing between interlocking cutouts will allow the possibility to package items of different sizes effectively and snugly, and thereby permit protection of these items.
It should be understood that the dimensions of the sections of the long support insert described herein can vary depending on the size of the corrugated cardboard box in which the components are to be used. By way of example only, in one embodiment the height of the long support insert 210 is about 6 inches; the length of the middle panel 212 is about 9.875 inches, and the length of the first side and second side panels 211, 213 is about 3.5 inches.
Other embodiments of the long support insert 210 and their approximate measurements are listed below with reference to corresponding corrugated cardboard box:
The exemplary embodiment shown in
It can be seen from
In the exemplary embodiment, the height of the long support insert is the same height as the interior side walls of the container 290, but of course they can also be shorter. The insert height should be such that, when the container is sealed, the inserts do not protrude out of the container and do not obstruct the sealing of the container.
Put another way, the two long support inserts 210, 220 as illustrated in
Depending upon the box, the desired number and size of the compartments to be created with inserts, several variables can be manipulated. For example, in the illustrated examples, the side panels are of equal length. However, this need not necessarily be the case. Side panels on one side of the long support insert may be longer than those on the other side, when deployed, but the added lengths would still approximate the length of the interior lateral wall of the box so that the insert is snugly held in position. In this instance, when the long support insert is deployed, the middle panels 212, 222 are no longer centered in the corrugated box 290 but are positioned according to the relative lengths of the first side panels (not shown) and the second side panels 213, 223. Accordingly, the compartments are offset from center and have different sizes.
The functionality described above regarding changing the configuration of a two-cell load plan to a four- or six-cell load plan (or more, as required) using short support inserts, in conjunction with long support inserts, is illustrated in
Another component of the inventive packaging system is the short support insert, exemplified in
Referring to
By way of example, in one embodiment the height of a panel 332 is about 6 inches, the length of the middle panel 332 is about 6.875 inches, and the length of the first side and second side panels 331, 333 is about 2.5 inches.
Other embodiments of the short support insert 330 and their approximate measurements are listed below with reference to corresponding corrugated cardboard box:
The interlocking cutout 314 of the long support insert 310 is designed to accommodate the thickness of two short support inserts, and similarly, the interlocking cutout 334 of the short support insert 330 is also designed to accommodate the thickness of two long support inserts. The length of the interlocking cutouts 314, 334 measures to be half of the width of the long support insert 310 and the short support insert 330, and in the present exemplary embodiment, the length of the interlocking cutouts 314, 334 is approximately 3 inches.
As shown in
The short support inserts 330, 340 are deployed and configured in a similar manner to the configuration of the long support inserts 310, 320 of the present exemplary embodiment but in a 90 degree off set orientation.
The first side panels 331, 341 of the short support inserts 330, 340 are folded perpendicular to the middle panels 332, 342 but in opposing directions, and the second side panels (not shown) of the short support inserts 330, 340 are likewise folded perpendicular to the middle panels 332, 342 but in opposing directions. The short support inserts 330, 340 are oriented so that the registering pair of interlocking cutouts 334 (other not visible) of the short support inserts 330, 340 are located on the bottom half of the short support inserts 330, 340 and open downward. The interlocking cutouts of the short support inserts 330, 340 line up with the interlocking cutouts 314, 324 of the long support inserts 310, 320. The short support inserts 330, 340 are pushed downward into interconnection relationship so that the long support and short support inserts are locked at 90 degrees to each other. In this embodiment, the interlocking cutouts of both the long support inserts 310, 320 and the short support inserts 330, 340 are designed to accommodate half the height of the inserts such that when interlocked in vertical deployed position in the box, the inserts each span the entire width of the other insert. Of course, that may not be necessary in all cases, and it may be desirable to have a gap at the top or bottom when the inserts are interlocked and deployed in the box.
As illustrated in
The functionality of another exemplary embodiment of the invention can accommodate a variety of load configurations, one of which is illustrated by
Referring to
In the embodiment shown in
Also shown in the embodiment of
It can be understood that the flexibility of the instant packaging system and its components provides for a larger variety of configurations that can accommodate a number of different load plans or load patterns. The examples provided by the drawings are only a few of the potential configurations. In particular, the long support inserts that are of a double-layered construction, along with the end panels that in deployed position extend completely across the width of the box interior, and abuts and urges against the adjacent box wall, provides added strength and resistance to applied outside forces to the box. The number of interlocking cutouts in the long support insert and the spacing between these allow flexibility in number and size of short support inserts, and thus number of compartments.
While examples of embodiments of the technology have been presented and described in text and also by way of illustration, it will be appreciated that various changes and modifications may be made in the described technology without departing from the scope of the inventions, which are set forth in, and only limited by, the scope of the appended patent claims, as properly interpreted and construed.
The following clauses are offered as further description of the disclosed invention:
1. A corrugated cardboard box comprising:
a vertical compartmented insert nested within the corrugated cardboard box, wherein the vertical compartmented insert comprises a rectangular vertical array of interior dividing walls forming there between a plurality of rectangular compartments, each having a storage volume, the compartmented insert comprising:
a pair of back-to-back long support inserts extending along a length of the corrugated cardboard box to form a longitudinal vertical wall, each one of the pair of long support inserts having a plurality of interlocking cutouts that registers with a respective interlocking cutout of another of the pair of long support inserts;
a plurality of pairs of short support inserts, the pairs of short support inserts assembled back-to-back and arrayed perpendicularly to the pair of long support inserts to form a plurality of lateral walls, each of the plurality of pairs of back-to-back short support insert assemblies having registration of interlocking cutouts to form a common cutout in the back-to-back assembly, the interlocking cutouts of the pairs of back-to-back short support inserts registering with and mechanically locking with the interlocking cutout of the pair of long support inserts such that the pair of long support inserts and the plurality of back-to-back short support inserts create the plurality of rectangular compartments there between;
wherein each of the pair of long support inserts has a middle panel flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back long support inserts extend outboard in opposite directions at right angles to the middle panel, abut flush against, and urge against a first interior wall surface of the corrugated box, and the second side panels of each of the back-to-back long support inserts extend outboard in opposite directions at right angles to the middle panel, abut flush against, and urge against a second interior wall surface, opposite to the first interior wall surface, of the corrugated box;
wherein each of the plurality of back-to-back assemblies of short support inserts includes a middle panel, flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back short support inserts extend outward in opposite directions at right angles to said middle panel, abut flush against, and urge against a third interior wall surface of the corrugated box, and the second side panels of each of the back-to-back short support inserts extend outward in opposite directions at right angles to said middle panel, abut flush against, and urge against a fourth wall surface, opposite to the third interior wall surface of the corrugated box.
2. The corrugated cardboard box of any preceding clause, wherein the long support insert and the plurality short support inserts are each comprised of corrugated cardboard box.
3. The corrugated cardboard box of any preceding clause, wherein corrugations of the corrugated cardboard material are arrayed vertically in the rectangular vertical array of interior dividing walls.
4 The corrugated cardboard box of any preceding clause, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back long support inserts is equal to a width of respective interior wall against which the side panels abut.
5. The corrugated cardboard box of any preceding clause, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back long support inserts is equal to a width of respective interior wall against which the side panels abut and wherein configuration of the side panels is such as to direct externally applied force to the first and second walls to the back-to-back middle panels of the long support inserts thereby increasing structural rigidity of the corrugated cardboard box.
6. The corrugated cardboard box of any preceding clause, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back short support inserts is less than a width of respective interior walls against which the side panels abut.
7. The corrugated cardboard box of any preceding clause, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back short support inserts is less than a width of respective interior wall against which the side panels abut, and wherein configuration of the side panels is such as to direct externally applied force to the third and fourth walls to the back-to-back middle panels of the short support inserts thereby increasing structural rigidity of the corrugated cardboard box.
8. The corrugated cardboard box of any preceding clause, wherein the long support insert includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, that extend outward in the same direction at right angles to the middle panel.
9. The corrugated cardboard box of any preceding clause, wherein each of the pair of back-to-back long support inserts includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, such that the back-to-back pair of long support inserts has at each end two side panels extending outward in opposite directions.
10. The corrugated cardboard box of any preceding clause, wherein each of the plurality of short support inserts includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the short support insert into a middle panel flanked by a first and a second side panel, that each extend outward in the same direction at right angles to the middle panel.
11. The corrugated cardboard box of any preceding clause, wherein each of the plurality of pairs of back-to-back assembled short support inserts includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, such that each of the plurality of back-to-back assembled pairs of long support inserts has at each end two side panels extending outward in opposite directions.
12. A corrugated cardboard box comprising:
a first vertical compartmented insert nested within the corrugated cardboard box, wherein the first vertical compartmented insert comprises a rectangular vertical array of interior dividing walls forming there between a plurality of rectangular compartments, each having a storage volume, the compartmented insert comprising:
a pair of back-to-back long support inserts extending along a length of the corrugated cardboard box to form a longitudinal vertical wall, each one of the pair of long support inserts having a plurality of interlocking cutouts that registers with a respective interlocking cutout of another of the pair of long support inserts;
a plurality of pairs of short support inserts, the pairs of short support inserts assembled back-to-back and arrayed perpendicularly to the pair of long support inserts to form a plurality of lateral walls, each of the plurality of pairs of back-to-back short support insert assemblies having registration of interlocking cutouts to form a common cutout in the back-to-back assembly, the interlocking cutouts of the pairs of back-to-back short support inserts registering with and mechanically locking with the interlocking cutout of the pair of long support inserts such that the pair of long support inserts and the plurality of back-to-back short support inserts create the plurality of rectangular compartments there between;
wherein each of the pair of long support inserts has a middle panel flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back long support inserts extend outboard in opposite directions at right angles to the middle panel, abut flush against, and urge against a first interior wall surface of the corrugated box, and the second side panels of each of the back-to-back long support inserts extend outboard in opposite directions at right angles to the middle panel, abut flush against, and urge against a second interior wall surface, opposite to the first interior wall surface, of the corrugated box;
wherein each of the plurality of back-to-back assemblies of short support inserts includes a middle panel, flanked by a first side panel and a second side panel, such that in deployed position in the corrugated box, the first side panels of each of the back-to-back short support inserts extend outward in opposite directions at right angles to said middle panel, abut flush against, and urge against a third interior wall surface of the corrugated box, and the second side panels of each of the back-to-back short support inserts extend outward in opposite directions at right angles to said middle panel, abut flush against, and urge against a fourth wall surface, opposite to the third interior wall surface of the corrugated box;
wherein a sum of horizontal lengths of opposed side panels at an end of each of the pair of back-to-back long support inserts is equal to a width of respective interior wall against which the side panels abut; and
wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back short support inserts is less than a width of respective interior walls against which the side panels abut.
13. The corrugated cardboard box of clause 12, wherein the long support insert and the plurality of short support inserts are each comprised of corrugated cardboard material.
14. The corrugated cardboard box of clause 13, wherein corrugations of the corrugated cardboard material are arrayed vertically in the rectangular vertical array of interior dividing walls.
15. The corrugated cardboard box of any one of clauses 12-14, wherein a sum of horizontal lengths of opposed side panels at an end of each of the back-to-back long support inserts is equal to a width of respective interior wall against which the side panels abut and wherein configuration of the side panels is such as to direct externally applied force to the first and second walls to the back-to-back middle panels of the long support inserts thereby increasing structural rigidity of the corrugated cardboard box.
16. The corrugated cardboard box of any one of clauses 12-15, wherein configuration of the side panels is such as to direct externally applied force to the third and fourth walls to the back-to-back middle panels of the short support inserts thereby increasing structural rigidity of the corrugated cardboard box.
17. The corrugated cardboard box of any one of clauses 12-16, wherein the long support insert includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, that extend outward in the same direction at right angles to the middle panel.
18. The corrugated cardboard box of any one of clauses 12-17, wherein each of the pair of back-to-back long support insert includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, such that the back-to-back pair of long support insert has at each end two side panels extending outward in opposite directions.
19. The corrugated cardboard box of any one of clauses 12-18, wherein each of the plurality of short support inserts includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the short support insert into a middle panel flanked by a first and a second side panel, that each extend outward in the same direction at right angles to the middle panel.
20. The corrugated cardboard box of any one of clauses 12-19, wherein each of the plurality of pairs of back-to-back assembled short support inserts includes a pair of spaced apart score lines extending across a width thereof, the score lines providing ease of folding of the long support insert into a middle panel flanked by a first and a second side panel, such that each of the plurality of back-to-back assembled pairs of long support inserts has at each end two side panels extending outward in opposite directions.