KEEP PRODUCE FRESHER LONGER: Rubbermaid FreshWorks Produce Saver uses FreshVent technology to regulate airflow, so your produce stays fresher longer.BUILT-IN FILTER: The built-in FreshVent filter in these Rubbermaid containers regulates the flow of oxygen and carbon dioxide to create the optimal environment for your fresh produce; the filter lasts a lifetime—no refills neededELEVATED BASE: The elevated base in these plastic containers lifts produce away from moisture and promotes proper airflowEASY-CARE: BPA-free containers are dishwasher-safeEASY TO USE: Simply place unwashed and uncut produce in the FreshWorks container and place container in the fridge; FreshWorks works best when only one type of produce is stored in a containerSPACE SAVING: Modular, space-efficient design for easy kitchen organization; bases nest inside each other, and one lid fits multiple basesWHAT YOU'LL USE THEM FOR: Medium short container: blueberries; large container: iceberg lettuce, spinachSET INCLUDES: One 4.6-cup medium short and one 18.1-cup large container and lids for a total of 4 pieces