The loop design can be hung on the of the backpack and on the belt, making it more convenient to carry Foldable design, easy to carry, does not take up space. Can be refrigerated in the refrigerator, will not be deformed or damaged due to freezing. Can be used as an ice pack for cold compresses. Suitable for outdoor camping, barbecue, more convenient than traditional plastic water tank. High-quality environmentally friendly PP material, safe and non-toxic.