The ornamental design for a beltkeeper, as shown and described.
FIG. 1 is a perspective view of a belt keeper showing my new design, the
broken line showing of a belt is for illustrative purposes only and forms
no part of the claimed design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a right side elevational view, the left side being a mirror
image; and,
FIG. 5 is a top plan view, the opposite side being a mirror image.