This clear 4 quart square container saves you shelf space by holding up to 25% more than a round container of the same size. It's break‐resistant polycarbonate construction is smooth, easy to clean and dishwasher safe, with clear measurement gradations marked in red. This container withstands temperatures from ‐40°F to 212°F and also nests when not in use. This is recommended for holding and storage purposes only. Use with the 6509 lid. In compliance with California AB1200 and Colorado HB22-1345 Rubbermaid has notified us that this product contains BPA.