Backpack

FIG. 1 is a front, top perspective view of a backpack;

FIG. 2 is a back, bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a left-side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The short dashed broken lines depict portions of the backpack that form no part of the claimed design. The long dashed broken lines represent stitching that forms no part of the claimed design.