Built to last, this strong plastic storage box is made from impact resistant polypropylene. Maximize your storage space with this 5.5L letter-sized container, strong enough to stack with double reinforced base and corners. Keep your contents dust and moisture free, clip-lock clamps securely lock the lid tightly in place. Ideal for organizing your home, office, classroom, workspace and garage. All Bankers Box® plastic storage boxes are 100% BPA free