Rubbermaid FreshWorks Produce Food Storage Saver Container keeps producing fresher ones longer. The FreshVent technology filter naturally regulates the flow of oxygen and carbon dioxide to create the optimal environment for your fresh produce. The filter lasts the lifetime of the container, with no refills needed. The elevated base lifts produce away moisture and promote proper airflow to prevent spoilage. The modular, space-efficient design allows for easy kitchen organization—bases nest inside each other and one lid fits multiple bases to keep cabinets tidy. These plastic containers are BPA-free and dishwasher-safe for easy care. Modular, space-efficient design for easy kitchen organization; bases nest inside each other, and one lid fits multiple bases. One 4.6-cup medium short, one 7.2-cup medium, and one 18.1-cup large container and lids for a total of 6 pieces