Backpack

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

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The short evenly spaced broken lines in the drawings depict stitching that form no part of the claimed design. The long evenly spaced broken lines in the drawings depict portions of backpack that form no part of the claimed design.