Stackable drawer stacks on Iris stacking drawers of similar size. Ideal for organizing closets and storing supplies. Stacking drawer is made of durable polypropylene (BPA-free and PVC-free) with a black body and clear drawer or easy viewing of contents. Design features a drawer stop and inside ridge so the drawer glides on less surface for a smooth opening and closing. Drawer holds 4.25 gallons (17 quarts).