The 5cup containers have 2 different settings. 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. Also leakproof, BPA-free.