BPA FREE MATERIAL: environmental friendly 5L/10L water containers, made of transparent, soft polymer, durable and reusableSPACE-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 backpackWIDE 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 emergencyINNOVATIVE 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 carryEASY 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.