This collapsible storage container with lids is made of PP material, a kind of sturdy plastic. It's the ideal organizers and storage for bedroom, dorm room, closet, bathroom, kitchen; Also a perfect fit and an attractive storage option for kids' toys, arts and crafts supplies. The storage bins are stackable which will hihgly save space and improve organization of home and rooms. The size of the plastic storage bins with lids measures: Length 19.5 in; Width 12.5 in; Height 12 in. 8.5 Gal large capacity storage container will be effective to organize room essentials. Warm tips: If you have heavy items in the containers, the container on the bottom is hard to close, seemingly looking like there is pressure from the top containers. So please avoid putting over weighted items in the storage container.