The Rubbermaid locking lid food storage set is available as a 20-piece set with different sizes to meet all your storage needs. It helps keep food fresh at home or on the go. The 4 locking tabs ensure an airtight seal and also prevent accidental spills. The Easy Find Lids system keeps the set neatly organized. The lids in this plastic food storage set can be snapped to each other or to the base of the containers for easy storage. Each lid fits any base. They also have built-in rubberized seals. This airtight food storage container is BPA free for safety. All the pieces are microwave and dishwasher safe.