Abstract: A storage unit includes a tray including a bottom surface and sidewalls connected to an outer perimeter of the bottom surface. The tray has an open top surface in fluid communication with the ambient surroundings. The sidewalls extend upward from the bottom surface and are registered perpendicular thereto. Opposed sidewalls are provided with equidistantly spaced notches formed therein that extend along a length of the tray. Corresponding notches are aligned along the opposed sidewalls. Coextensive and linear dividers are positioned into the notches and define isolated chambers. A mechanism is included for conjoining the tray to a ladder rung such that the tray becomes situated along a horizontal plane on top of the ladder rung. The conjoining mechanism is spaced from the dividers and the bottom surface of the tray respectively.