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The ornamental design for a back pack, as shown and described. |
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FIG. 1 is a perspective view of a back pack showing my new design;
FIG. 2 is a rear elevational view;
FIG. 3 is a top plan view;
FIG. 4 is a side elevational view; and
FIG. 5 is a bottom plan view.
The partial showing of surface shading indicating a fabric texture is understood to be continuous over those surfaces where shown.
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