The ornamental design for a storageunit for decorativelight strings, as shown and described.
The sole FIGURE is a front view of my new storage unit for decorative light strings.
The back view is a mirror image of the front view; and
The top, sides and bottom are flat and there of; have no interior or exterior moving parts, handles, locks or attachments which completes its appearance.
My storage unit for decorative light strings is characterized by a flat smooth piece of rigid material having four parallel openings that are identical in depth, length and width.