The Sterilite Ultra-Seal 3.1-Cup Container is a food storage container with color-coded bases and lids and is perfect for your favorite foods on the go. Never rummage to find a matching lid again.The lids on the containers are gasket-sealed with 4-latches. The seals are watertight and keep food fresh. A vent in the lid releases steam when placed in the microwave.The bases and lids are freezer, microwave, and dishwasher safe. The containers are also BPA and phthalate-free, making them extra safe for your family.