Portable Power Bank

FIG. 1 is a top, front and right side perspective view of a portable power bank, showing our new design;

FIG. 2 is a bottom, rear, left side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view showing a use state of the portable power bank.

The broken lines are included to show features that form no part of the claimed design.