The ornamental design for a beltloopunit, as shown and described.
FIG. 1 is a perspective view of a belt loop unit of the present invention, shown in an environment;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a top view thereof, the bottom view being a mirror image thereof.
The rear view forms no part of the claimed design.
The smaller broken lines shown on the surface of the belt loop unit in FIGS. 1-5 represent stitching and are part of the claimed design. The larger broken lines shown in FIGS. 1-6 represent environmental structure only and form no part of the claimed design.