plastic provided; pop your food in then vacuum seal the open end to extract all excess air and create an airtight packet. These sealed parcels of food can then be stored in the fridge, freezer or cupboard until you're ready to cook, reheat or serve. Thick heavy-gauge plastic prevents tainting and protects against freezer burn and, for added convenience when you come to defrost, cook or reheat, your food can stay in its sealed pouch making it really handy for popping straight into a pan of boili