The ornamental design for a glass/cup/mug holder, as shown and described.
FIG. 1 is an elevation view of a first exemplary embodiment of a glass/cup/mug holding arrangement showing our new design;
FIG. 2 is a side view of the glass/cup/mug holding arrangement of FIG. 1;
FIG. 3 is a rear view of the glass/cup/mug holding arrangement of FIG. 1;
FIG. 4 is a bottom view of the glass/cup/mug holding arrangement of FIG. 1;
FIG. 5 is a top view of the glass/cup/mug holding arrangement of FIG. 1; and,
FIG. 6 is a front view of the glass/cup/mug holding arrangement of FIG. 1.
The broken lines (if any) are provided for illustrative purposes only, and form no part of the claimed design. In addition, shadings are provided for illustrative purposes only, and do not form any portion of the claimed design.