Rubbermaid FreshWorks Produce Saver keeps produce fresher longer. The FreshVent technology filter naturally regulates the flow of oxygen and carbon dioxide to 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 from moisture and promotes 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.