The ornamental design for a tote bag, as shown and described.
FIG. 1 is a front, top and left side perspective view of the tote bag showing the new design;
FIG. 2 is a top plan thereof;
FIG. 3 is a front elevation thereof;
FIG. 4 is a right side elevation thereof, the left side elevation being a mirror image thereof;
FIG. 5 is rear elevation thereof;
FIG. 6 is a bottom plan thereof;
FIG. 7 is a front, top and left side perspective view of a second embodiment of the new design;
FIG. 8 is a top plan thereof;
FIG. 9 is a front elevation thereof;
FIG. 10 is a right side elevation thereof, the left side elevation being a mirror image thereof;
FIG. 11 is rear elevation thereof; and,
FIG. 12 is a bottom plan thereof.
The dotted lines depict stitching, and form part of the claimed design. The broken lines depict portions of the tote bag that form no part of the claimed design.