The lining of lunch bag is made of PEVA foil that won't melt easily when the bag hold something hot, at the same time, we use a high quality zipper which will minimize the possibility of broken zipper. The exterior of lunch bag is constructed out of 600D water-resistant dirt-proof oxford fabric for durability and water proofing and easy cleaning. Strong linen handles and heavy duty nylon connect by dense stitching that make the bag extremely durable, proud to carry your lunch. The lunch bag is made of insulated material which can keep foods and drinks cool or warm for more than 5 hours. Besides, the interior lining is made of food grade PEVA foil so you could put your foods into the bag directly. The built-in 6mm EPE foam provides great protection to your containers, foods and drinks.