The ornamental design for a suctioncuptowelholder, as shown and described.
FIG. 1 is a top, front, right side perspective view of a suction cup towel holder showing my new design;
FIG. 2 is a bottom, rear, left side perspective view thereof;
FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a front elevational view thereof, the rear elevational view being a mirror image thereof.
The broken line showing in the figures is included for the purpose of illustrating portions of the suction cup towel holder and form no part of the claimed design.