FoodSaver Freeze "N SteamBags are specially designed for easy filling. Get a head start on dinner by preparing your Freeze "N Steambags in advance -- simply fill the bag, season your food, vacuum seal, store in the freezer/ refrigerator and microwave when needed! FoodSaver Bags preserve, protect and prevent freezer burn with their channel-design that allows complete air removal. Multi-ply construction blocks moisture and oxygen and makes the bags strong enough to microwave!