Claims (1)
Claim 1 (Independent)
The ornamental design for a backpack, as shown and described.
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FIG. 1 is a front, left perspective view of an embodiment of a backpack showing my new design.
FIG. 2 is a front view of the backpack.
FIG. 3 is a rear view of the backpack.
FIG. 4 is a left side view of the backpack.
FIG. 5 is a right side view of the backpack.
FIG. 6 is a top view of the backpack; and,
FIG. 7 is a bottom view of the backpack.
The broken lines are environmental only and form no part of the claimed design.