Lock & Lock HPL20BS 20-Piece Polypropylene Food-Storage Container Set Food-storage containers in 1-3/4-, 2-, 2-4/5-, 3-2/5-, 3-2/3-, 5-1/2-, 6-3/4-, 11-, and 16-2/7-cup sizes Durable polypropylene construction; clear bases allow for better visibility of inside contents Lids with 4-hinge locking system create air- and water-tight seal Containers stack and nest to ensure space-saving storage in cupboards and drawers Safe to use in refrigerator, freezer, microwave, and dishwasher