Extra depth allows for larger, bulkier supplies. Use open core or customize up to eight compartments for multiple storage options. Also fits inside Super Satchel Cube! (6855SC). Also accommodates 6901AB Serger Thread Tray. All boxes in the Super Satchel Series are molded in ACID FREE polypropylene. All "Standard Depth", "Slim" and "Double Deep" models are stackable - 15.25" X 14" X 6.35"