We claim the ornamental design for a handbag, as shown and described.
FIG. 1 is a front perspective view of one embodiment of a handbag,
FIG. 2 is a front elevation view of the handbag,
FIG. 3 is a rear elevation view of the handbag,
FIG. 4 is a left side elevation view of the handbag,
FIG. 5 is a right side elevation view of the handbag,
FIG. 6 is a top plan view of the handbag; and,
FIG. 7 is a bottom view of the handbag.
All broken dashed dot dot lines illustrate a zipper, pull tab, and portions of the handbag to which the design is applied that form no part of the claim. All dashed lines illustrate stitching on the handbag and are part of the claimed design.