The ornamental design for a post for bath accessory, as shown and described
.
FIG. 1 is a left perspective view of a post for bath accessory showing my
new design, the broken lines shown are for illustrative purposes only and
form no part of the claimed design;
FIG. 2 is a bottom plan view thereof, the undisclosed top plan view being a
mirror image;
FIG. 3 left side elevational view thereof;
FIG. 4 is a right side elevational view thereof; and,