Lid/tray and base each have separate access. Comfortably fits on top of Super Satchel Cube. Each 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.