The ornamental design for a tote bag, as shown and described.
FIG. 1 is a perspective view of the design for a tote bag of the present invention;
FIG. 2 is a side elevational view of a first side of the tote bag of FIG. 1;
FIG. 3 is a side elevational view of a second, opposite side of the tote bag of FIG. 1;
FIG. 4 is a top view of the tote bag of FIG. 1;
FIG. 5 is an end elevational view of a first end of the tote bag of FIG. 4; and,
FIG. 6 is an end elevational view of a second, opposite end of the tote bag of FIG. 4.
Broken lines shown in the drawings are for the purposes of illustrating environmental structure and form no part of the claimed design. Furthermore, any portions of the tote bag not shown form no part of the claimed design.