PVC cooler handle bag 4 layers cooler bag,the out material is waterproof pvc material, the second material is the foam insulation. The third layer of the heat preservation material is aluminum membrane materials the inner material is 15s tpu material,it lets the bag 100% not leak water. Many cooler bag is leaked water when you used it becuase of have no the tpu material. Our this bag 100%  is not leak,you don't worry when you use it. We use double zipper for the bag,and the zipper is "7 "size,it is very easy to pull it.