Use these FoodSaver Preserve & Marinate Vacuum Containers to lock in freshness and seal in flavor with 2 different settings to choose from. Turn the valve to Vacuum Mode and attach to a handheld sealer (sold separately) to help keep food fresh in the freezer fridge and pantry. Or switch to Marinate Mode to marinate meat fish and veggies in minutes instead of hours. These convenient FoodSaver containers nest and stack to help keep your kitchen organized and are designed with premium Tritan material for extreme durability so they won t crack or stain. These containers have a long-lasting vacuum seal a flexible lid with easy-open tabs and are dishwasher-safe for easy cleanup. They re compatible with all FoodSaver vacuum sealer systems.