Lid/tray and base each have separate access. Each side has 2 side bins with both fixed and removable dividers. Top tray and base both have fixed and removable dividers. All boxes in the Super Satchel Series are molded in Acid Free polypropylene. All Standard Depth, Slim and Double Deep models are stackable. Dimensions 17-1/4in x 16-3/4in x 5in.