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 elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a left side elevational view thereof.
The broken lines in FIGS. 1 and 4, illustrating elements of the interior of the tote, show unclaimed elements, and form no part of the claimed design. Broken lines on the exterior of the tote depict stitching, and are included as part of the claimed design.