Material: this lunch bag is made of 3 layer material, the outside layer is thick oxford fabric, the middle layer is 6mm thick Insulation EPE foam, the inside layer is thick aluminum foil Long Time Insulation: the thickened lunch bag could keep food cool or warm for more than 5 hours Perfect Size: the lunch bag size is 9.8 inch length, 6.7 inch height, 5.9 inch wide Easy to Clean: the PEVA lining is waterproof and easy to clean stain Reusable and Durable: the thickened material lunch bag could reusable use for years and the zipper is heavy duty metal, warn: cannot use for children under 15 years alonely Thickened Reusable Insulated Lunch Bag for Women and Men Travel Picnic and Lunch Box