Portable power pack

FIG. 1 is a front perspective view of a first embodiment of an ornamental design for a portable power pack;

FIG. 2 is a rear perspective view of the first embodiment thereof;

FIG. 3 is a front view of the first embodiment thereof;

FIG. 4 is a rear view of the first embodiment thereof;

FIG. 5 is a first side view of the first embodiment thereof;

FIG. 6 is a second side view of the first embodiment thereof;

FIG. 7 is a top view of the first embodiment thereof; and

FIG. 8 is a bottom view of the first embodiment thereof.

FIG. 9 is a front perspective view of a second embodiment of an ornamental design for a portable power pack;

FIG. 10 is a rear perspective view of the second embodiment thereof;

FIG. 11 is a front view of the second embodiment thereof;

FIG. 12 is a rear view of the second embodiment thereof;

FIG. 13 is a first side view of the second embodiment thereof;

FIG. 14 is a second side view of the second embodiment thereof;

FIG. 15 is a top view of the second embodiment thereof; and,

FIG. 16 is a bottom view of the second embodiment thereof.

The broken lines shown in FIGS. 1-8 , that are immediately adjacent to the shaded areas, and define unshaded regions, represent the bounds of the first embodiment and form no part of the claimed design. All other broken lines are for the purpose of illustrating environmental structure and form no part of the claimed design of the first embodiment.