polyesterMaterials of organizing bins improved stronger and more durable. Perfect organizer bins for organizing and reducing home or office clutter! Household essentials for bedroom organization and storage closet storage clothes storage dorm storage.Outer surface of storage bins is made of polyester inner surface made of oxford cloth much sturdier and more durable than storage bins of nonwoven. A good choice of lid organizers for room organization or office storage.Plastic boards for insert and a removable bottom plastic support board enhance the stability and stackability of the storage bins no more odour and lhtweht compared with storage bins with paperboard.Thanks to materials improvements our folding storage boxes are washable when they accidentally get dirty! Collapsible desn allows the storage boxes to be folded flat for saving space when not in use.