Lock & Lock HPL10BS 10-Piece Polypropylene Food-Storage Container Set Food-storage containers in 2-1/2-, 3-3/5-, 5-, 11-, and 16-4/5-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