The ornamental design for a storageunit, as shown and described.
FIG. 1 is a top, front, and right side perspective view of a storage unit
showing my new design, the left side being a mirror image of that shown
and the bottom being plain and unornamented;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof; and
FIG. 4 is a top, front, and right side perspective view of an alternate
embodiment thereof, the left side being a mirror image of that shown and
the bottom being plain and unornamented.