FIG. 1 is a top, front, and right side perspective view of an ornamental design for a shoulder bag;
FIG. 2 is a front side elevational view thereof;
FIG. 3 is a rear side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a right side elevational view of the shoulder bag with the flap unfolded;
FIG. 9 is a front side elevational view of the shoulder bag with the flap unfolded;
FIG. 10 is a top plan view of the shoulder bag with the flap unfolded;
FIG. 11 is a right side elevational view of the shoulder bag with the flap unfolded and the interior stretched open;
FIG. 12 is a top plan view of the shoulder bag with the flap unfolded and the interior stretched open; and,
FIG. 13 is a front side elevational view of the shoulder bag with the shoulder strap length adjusted.
The broken lines depicting the stitching of the shoulder bag shown in the drawings are for illustrative purposes only and form no part of the claimed design.