DURABLE: 4 mil thickness. These foil mylar bags with an aluminum foil layer can prevent tearing and destroying, puncture resistance, not easy to break leakage, to meet your long term dry storage requirements.RESEALABLE and REUSABLE: Zip lock stand up bags are resealable, so you can use them over and over again. Resealable bags can protect the food from moisture, fit for long-time food preservation.HEAT SEALING: You can use heat sealing machine (not included) to seal away from light and oxygen barrier, prevent food being exposed to air, light, odors and moisture, these foil pouch bags can extend the storage time of food.MULTI-PURPOSE: These mylar bags are suitable for storing food, coffee, tea, dried food, dried fruit, etc.; Suitable for packing, storing, sampling and sorting.EASY TO USE: there is a U shape tear on the side for easy tear, save time to find a knife or scissors, sealable with hot iron, heat sealing ensures a long term protection, these mylar bags can reseal after opening, lasting for a long time.SPECIFICATIONExterior Size: 12"(Width) × 19.5" (Length) + 4"(Gusset)Interior Size: 11"(Width) × 18.5"(Length) + 4"(Gusset)Thickness: 4 mil (110um)Material: Aluminum FoilBarrier Level: GreatRe-closable ZipperHang HoleTear NotchMade in USAFEATURESHeat SealableMoisture ProofSmell ProofIncrease Shelf LifeMade in U.S.ACOMPLIANCEBPA FreeTSE and Sulfer FreePthalates FreeFDA Food GradeR.E.A.C.H and RoHS CompliantKosher