Harvest Right designs these mylar bags for storing freeze-dried foods made using their Freeze Dryers. These food-grade bags are seven mils thick. This pack contains 50 bags. Choose your desired size below. Oxygen and water are the two major components that cause food to spoil. Harvest Right engineers these bags to be both airtight and watertight. Use them to store your freeze-dried foods and prevent spoilage. Pair these bags with Oxygen Absorbers for maximum efficiency. This packaging combination allows your freeze-dried foods to maintain their taste, appearance, and nutrition for up to 25 years! Need a sealer? Check out the Harvest Right Mylar Starter Kit.