Each Super Satchel cube comes with instructions and all hardware for easy assembly. In addition, the interior walls of each cube are pre-drilled with a series of rows of ports to accommodate a custom designed rail, which acts as a support system. The Super Satchel boxes can not only be stored, but slide out for easy access to all of your supplies. Each Super Satchel Cube comes with 6 sets of rails, which allow you to store both slim and deep Super Satchel Boxes. The tops and bottoms of each cube are pre-drilled and include pegs for a stacking option. Caps for the top holes of each cube are also included for a finished look. Color: White * This product is also compliant with current regulations in the State of California.