Rubbermaid Lock-Its Food Storage Containers with Easy Find Lids, 12-Piece Set 1832504 4 locking tabs for an extra-secure lid seal. Built-in rubberized seal makes it easy to clean. Lids snap to bases and to other lids for easy storage. 15-cup square food-storage container with clear polypropylene base. Microwave, freezer and dishwasher safe. Made in the USA.