The ornamental design for a drinkingvessel, as shown and described.
FIG. 1 is a top front perspective view of a drinking vessel showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a cross-sectional view taken along 8-8 of FIG. 6.
The even-length broken lines depicting of the unshaded elements of the drinking vessel in FIG. 8 show features that form no part of the claimed design. The uneven-length broken lines depicting the remainder of the drinking vessel in FIGS. 6 and 8 show features that form no part of the claimed design.