I claim, the ornamental design for a bag, as shown and described.
The file of this patent contains at least one photograph executed in color. Copies of this patent with color photographs will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a perspective view of a bag, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof, taken from the left of FIG. 2;
FIG. 5 is a side view thereof, taken from the right of FIG. 2;