70% Nylon . Material: Waterproof Pu+High-Density Foam+Leak-proof Liner . Keep The Temperature Low:The backPack cooler is made of heavy duty nylon which will not rip, tear or scratch, but lightweight to carry.The nylon material inside the backPack can effectively prevent the hot air from entering. Whether it is ice cubes, ice cream, or cold drinks, it can effectively prevent melting. . Capacity BackPack Cooler:Cooller BackPack dimension is 12.6"x13.8"x7.1",can hold 30L of capacity. Roomy enough to Pack ice cream,beers,beverages,fruits,ice cube and all your other necessities.Perfect insulated cooler backPack for hiking, camping, picnics, beach. . Beautiful and lovely appearance: the ice bag will have many styles, leopard pattern, sunflower pattern, flower style, etc. It can be accepted by children or adults, smooth hand feeling and bright colors . Lightweight & Durable:The weight of the whole bag is 0.375kg/0.83lb, which is very light, whether it is an adult or a child, it can be easily carried. The backPack is made of cloth material, which is very durable, can be beaten and pulled, and is waterproof and sandproof.