The ornamental design for releasable retainer for holding a towel on a rack, as shown, and described.
FIG. 1 is a front elevational view of a releasable retainer for holding a
towel on a rack showing a first embodiment of my new design;
FIG. 2 is a top, front, and left side elevational view thereof, the right
side being a mirror image of the left, and the bottom and rear being plain
and unornamented;
FIG. 3 is a front elevational view of a releasable retainer for holding a
towel on a rack showing a second embodiment of my new design; and,
FIG. 4 is a top, front, and left side elevational view thereof, the right
side being a mirror image of the left, and the bottom and rear being plain
and unornamented.