Fresher longer. Keeps produce fresher longer. Freshvent technology. Lifetime filter. Store produce unwashed and uncut for optimal performance. Freshvent Technology: Innovative filter regulates the flow of O2 and CO2 to create the optimal environment for your fresh produce. Filter lasts a lifetime. No refills needed. Base elevates produce away from moisture and promotes proper airflow to prevent spoilage. Perfect organization: Modular, space-efficient design for exceptional organization. Bases nest inside each other. One lid fits multiple bases. Sized for various produce needs: 5 sizes available.