The ornamental design for a drinkingvesselholder, as shown and described.
FIG. 1 is a front side elevation view of a drinking vessel holder
FIG. 2 is a rear side elevation view of the drinking vessel holder of FIG. 1.
FIG. 3 is a perspective view of the drinking vessel holder of FIG. 1, partially opened.
FIG. 4 is a top view of the drinking vessel holder of FIG. 1.
FIG. 5 is a bottom view of the drinking vessel holder of FIG. 1; and,
FIG. 6 is a perspective view of the drinking vessel holder of FIG. 3.
The broken lines in FIGS. 1-4 and 6 are illustrative of environment, depicting a drinking vessel and human fingers which are not intended to form a part of the claimed design.