I claim the ornamental design for a handbag, as shown and described.
FIG. 1 is a front elevational view of a handbag of the claimed design;
FIG. 2 is a rear elevational view of the handbag shown in FIG. 1;
FIG. 3 is a right side elevational view of the handbag shown in FIG. 1;
FIG. 4 is a left side elevational view of the handbag shown in FIG. 1;
FIG. 5 is a top plan view of the handbag shown in FIG. 1;
FIG. 6 is a bottom plan view of the handbag shown in FIG. 1; and,
FIG. 7 is a front perspective view of the handbag shown in FIG. 1.
The claimed design is shown in solid lines in the figures. The dashed broken lines in the figures represent stitching and are part of the claimed design.