1Ultra-thin polymer, BPA-free, safe, reliable, durable and reusable. 2_x000D_Folding design: ultra-small size after storage, even in the pocket of jeans. Very space saving. 3_x000D_Wide range of applications: Portable water bag is a removable water tank, perfect for your camping, garden, cemetery, vacation, hiking, hunting, tourism, outdoor, picnic, barbecue and other water and other beverage storage, is also a perfect Gasoline emergency bag. 4_x000D_Innovative design: Unlike ordinary water bags, the large screw cap provides leak-proof sealing. The large 1.38-inch bottle opening is convenient for filling and pouring. The wear-resistant portable hand can be hung on the back and easy to carry. 5_x000D_It can be frozen, but the capacity of water when freezing should not exceed half of the container to avoid freezing and rupture.