BPA FREE MATERIAL: environmental friendly 5L/10L water containers, made of transparent, soft polymer, durable and reusable SPACE-SAVING AND PORTABLE: Collapsible and ultra light, fold it up when empty into smaller size for easy storage and carry, wearable thickening free hook designed, portable, can be hung on your backpack WIDE APPLICATION: Portable water tank is a movable water tank, ideal for water and other drinks storage for your camping, garden, cemetery, vacation, hiking, hunting, travel, outdoor, picnic, BBQ, etc, also perfect as a petrol bag for emergency INNOVATIVE DESIGNS: Unlike ordinary water bag, the large screw-on cap provides a leak-proof seal, the large 1-inch bottble opening for easy filling and pouring, the wearbale portable hook for hanging on a backback, portable and convenient to carry EASY TO USE : Folds when not in use and stands up when full as a water dispenser, Note: Before freezing, filled with water should not exceed half of the volume, to avoid being frozen bursting. Cut the bag when need homemade ice.