Designed to work with the Fresh & Save vacuum pump system, this large container set slows down oxidation, so salads stay crisp, fruits stay juicy and sandwiches fresh while locking in vitamins and flavor. Made of BPA-free, lightweight plastic, the lunch box packs up easily and includes a compartment divider to keep foods separated. To use, lock the vacuum pump (sold separately in vacuum pump set) onto the container valve and push the button to extract air, locking in flavor, aroma and nutrients.