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The ornamental design for a backpack, as shown and described. |
FIG. 1 is a front view of the backpack;
FIG. 2 is a rear view of the backpack;
FIG. 3 is a side view of the backpack as seen from the right in FIG. 1;
FIG. 4 is a side view of the backpack as seen form the left in FIG. 1;
FIG. 5 is a top view of the backpack; and,
FIG. 6 is a bottom view of the backpack.
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