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 lifetimeno refills needed ELEVATED BASE: The elevated base in these plastic containers lifts produce away from moisture and promotes proper airflow EASY-CARE: BPA-free containers are dishwasher-safe EASY 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 container SPACE SAVING: Modular, space-efficient design for easy kitchen organization; bases nest inside each other, and one lid fits multiple bases WHAT YOU'LL USE THEM FOR: Medium containers: strawberries, blueberries; large containers: iceberg lett