FIG. 1 is a front perspective view of a first embodiment of a backpack;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front perspective view of a second embodiment of the backpack;
FIG. 9 is a front elevation view thereof;
FIG. 10 is a rear elevation view thereof;
FIG. 11 is a left side elevation view thereof, the right side elevation view being a mirror image thereof;
FIG. 12 is a top plan view thereof; and,
FIG. 13 is a bottom plan view thereof.
The broken lines shown in the drawings depict portions of the backpack that form no part of the claimed invention.