The cube fits into most cube organizing systems, including IKEA Kallax. It features cardboard inserts that keep the sides and bottom stiff and constructed. The bottom insert removes for easy collapse and store when not in use. Its base fabric is constructed of durable 100% cotton canvas to hold up to your little one's wear and tear, and the animal design is embroidered felt. This bin is also embroidered on the edges to keep the design from being peeled or pulled off. Details: Purple hippo design 13" x 13" x 13" bin Cardboard inserts keep sides and bottom stiff Removable bottom insert Collapsible when not in use Felt embroidered design Cotton canvas base fabric