Backpack

FIG. 1 is a top, front, right side perspective view of a backpack showing the new design.

FIG. 2 is a front side view thereof.

FIG. 3 is a rear side view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dash-dash broken lines show stitching which forms no part of the claimed design. The uneven broken lines show a zipper which forms no part of the claimed design.