Gascru (10) 5 Gallon 20"x30" Mylar Bags 7 Mil Thick for Dried Dehydrated and Long Term Food Storage-food Survival 20"x30" Food Grade Foil lined, 7 mil Thick. 7 Mil. The thicker the bag, the tighter the weave of the polyester - that is what gives it its strength Sealable With Hot Iron - Can Reseal After Opening Ideal for Quick Oats, Pasta, Mashed Potatoes, Rice, Beans, Dried and Dehydrated foods 7 Mil Mylar bags have been embraced due to its high tensile strength and its moisture, light, gas and aroma barrier properties. Mylar is also a good insulator against electrical disturbances These are some of the industry best food grade mylar bags available, and are almost double the thickness of ordinary 4.3 mil mylar bags.