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

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view of the backpack shown in FIG. 1, with the shoulder straps and fastening straps cut away for clarity of illustration to expose the area of the backpack beneath the straps;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a right side elevational view thereof, the left side elevational view being a mirror;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof.

The dot-dash-dot broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.

The dash-dash-dash broken lines shown in the drawings represent stitching lines.

The cross-hatched pattern shown in the drawings represents a textured, fabric surface.

The breaking away of straps represents indeterminate length.