The ornamental design for a tote bag, as shown and described.
FIG. 1 is a perspective view of a tote bag showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right-side view thereof;
FIG. 5 is a left-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another perspective view thereof, with the tote bag shown in use.
The broken lines shown on claimed surfaces depict stitching and form no part of the claimed design. The evenly dashed broken lines in FIG. 8 showing items without any surface shading depict environment and form no part of the claim.