FIG. 1 is a top perspective view of an embodiment of a portable power pack showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a first end elevational view thereof; and,
FIG. 7 is a second end elevational view of the design.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.