I claim the ornamental design for a crossbody bag, as shown and described.
FIG. 1 is a perspective view of a crossbody bag;
FIG. 2 is a front elevation view of the crossbody bag of FIG. 1;
FIG. 3 is a rear elevation view of the crossbody bag of FIG. 1;
FIG. 4 is right side elevation view of the crossbody bag of FIG. 1;
FIG. 5 is a left side elevation view of the crossbody bag of FIG. 1;
FIG. 6 is a top plan view of the crossbody bag of FIG. 1; and,
FIG. 7 is a bottom plan view of the crossbody bag of FIG. 1.
The broken lines shown in the drawings are included for purposes of illustrating environment and form no part of the claimed design. The surface shading lines show contour and/or distinguish between open and solid areas. The surface shading lines are not surface ornamentation.