The ornamental design for a handbag, as shown and described.
FIG. 1 is a front perspective view of a handbag, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top open view thereof.
The dash-dash broken lines shown in the drawings depict stitching. The dot-dash broken lines shown in the drawings set the boundary of the claimed design. The dot-dot broken lines shown in the drawings illustrate portions of the handbag that form no part of the claimed design,
The interior of the handbag forms no part of the claimed design.