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The field of this device is cars.
A grocery grabber is essentially a seatbelt for groceries. Located in the walls of the trunk the grocery grabber will keep grocery bags from falling. You can put the bag against the wall. Then you will pull the “belt” out of the wall around the bag and put it into the clip. The clip and the piece that it secures can be the same clip used for a seatbelt and the strap can be of the same material of a seatbelt or more preferably a more elastic type material. If not in use the grocery grabber will be in the wall and would not take any space away from the trunk. Car manufactures can make and install this device in there cars with almost no downside. The grocery grabber has no downside because of its inexpensiveness and its being so compact that if you didn't need it you would not know it was there.