Backpack

FIG. 1 is a front view of a backpack showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is an enlarged left side view thereof, showing the strap of the backpack in another environment; and,

FIG. 8 is an enlarged rear view thereof, showing the strap of the backpack in another environment.

The broken lines and the deemphasized portions within depict portions of the backpack which form no part of the claimed design.