Bag

FIG. 1 is a front, right-side elevational view of a bag, showing the new design; FIG. 2 is a front elevational view thereof; and FIG. 3 is a rear elevational view thereof; FIG. 4 is a left-side elevational view thereof; FIG. 5 is a right-side elevational view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a front elevational view of the bag of FIG. 1 in a closed state. The broken lines depict parts of the bag that form no part of the claimed design.