1.REUSABLE FOOD GRADE MATERIAL: Made of food grade PEVA material and passed certified test to ensures the reusable food storage bags are BPA free, PVC, Chloride and Lead FREE. No silicone or plastic smell, safe for family use. 2.LEAK-PROOF ESAY SEAL: The reusable lunch bags feature an upgraded closures sealing technology that is more sealed, leak-proof, waterproof and hygienic, perfect for storing and preserving food. With the improved double closure and an anti-slip design, the reusable sandwich bags for kids is easier to open or close. The colorful double closure of reusable sandwich bags enriching your life more interesting and wonderful. 3. FREEZER SAFE EASY TO CLEAN: The reusable freezer bags can lock out freezer burn while keeping food fresh and full of taste, perfect for freezing meat, chicken, fish, fruits, and vegetables. We recommend HAND WASH, for the dishwasher will damage the double closure of the food storage bags. It is easy to clean with the bottle brush and put the bags on the top of a mug or cup to air dry. 4.MULTI-PURPOSE: reusable bags are the three-dimensional design that can stand up very well in the freezer and store more food. The reusable sandwich bags are the perfect container for sandwiches, snacks, lunch, vegetables, fruit, babies food, cosmetics, jewelry make-up, stationery, travel and more.