The ornamental design for a vessel, as shown and described.
FIG. 1. is a front perspective view of the new design;
FIG. 2 is a top view of the vessel shown in FIG. 1;
FIG. 3 is a bottom view of the vessel shown in FIG. 1;
FIG. 4 is a front view of the vessel shown in FIG. 1;
FIG. 5 is a rear view of the vessel shown in FIG. 1;
FIG. 6 is a right side view of the vessel shown in FIG. 1 (with the left side view being a mirror image thereof);
FIG. 7 is a bottom perspective view of the vessel shown in FIG. 1; and,
FIG. 8 is a cross-sectional cutaway side view of the vessel shown in FIG. 1.
The broken line showing of the faucet holes, drainage hole, spill hole, and bottom section of the vessel is for illustrative purposes only and forms no part of the claimed design.