The ornamental design for a bag, as shown and described.
FIG. 1 is a front view of a first embodiment of the invention.
FIG. 2 is a top view of the embodiment of FIG. 1.
FIG. 3 is a zoom-in top view of the embodiment of FIG. 1.
FIG. 4 is a perspective view of the embodiment of FIG. 1.
FIG. 5 is a rear-perspective view of the embodiment of FIG. 1, shown in an open configuration.
FIG. 6 is a front-perspective view of the embodiment of FIG. 1, shown in an open configuration; and,
FIG. 7 is a rear view of the embodiment of FIG. 1.
The logo “BVLGARI” depicted in certain figures merely represents written matter surface ornamentation which does not form any part of the claimed design.