100% polyester. Materials 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 non-woven. 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 lightweight compared with storage bins with paperboard. Thanks to materials improvements, our folding storage boxes are washable when they accidentally get dirty! Collapsible design allows the storage boxes to be folded flat for saving space when not in use. Lid organizers help keep dust away, perfect for clothes storage, files, papers, and toys organization; The organization bins have an easy-to-grab handle, making it easy to slide in and pull out when putting the organizing bins on the shelf or in the closet.