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;

FIG. 6 is a front elevational view of a 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 these straps;

FIG. 7 is a rear elevational view thereof;

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

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.