FIG. 1 is a front perspective view of a first embodiment of a new ornamental design for a shoulder bag;
FIG. 2 is a front view of the first embodiment thereof;
FIG. 3 is a rear view of the first embodiment thereof;
FIG. 4 is a first side view of the first embodiment thereof;
FIG. 5 is a second side view of the first embodiment thereof;
FIG. 6 is a top view of the first embodiment thereof; and
FIG. 7 is a bottom view of the first embodiment thereof.
FIG. 8 is a front perspective view of a second embodiment of a new ornamental design for a shoulder bag;
FIG. 9 is a front view of the second embodiment thereof;
FIG. 10 is a rear view of the second embodiment thereof;
FIG. 11 is a first side view of the second embodiment thereof;
FIG. 12 is a second side view of the second embodiment thereof;
FIG. 13 is a top view of the second embodiment thereof; and,
FIG. 14 is a bottom view of the second embodiment thereof.
The broken lines showing portions of the bag are for the purposes of illustrating environment and form no part of the claimed design.