BPA-Free Food-Grade Material: Made of odorless and food-grade polyethylene film, eco-friendly, reusable and refillable, 4 eco-friendly 5L water containers, well meet your water storage needs in different occasions. Wide Application: Suitable for outdoor barbecue, camping and domestic water. Great for survival and emergency kits. Store water, milk, tea, juice, alcoholic beverages, and dry goods like beans, grains, and coffee. In an emergency, it can be used as a petrol bag. Body Fit: Hakkin gives you two additional hydration caps. Solve the trouble that the water bag cannot be used due to the loss of the bottle cap. And the hat is universal. INNOVATIVE DESIGN LEAK-PROOF LID: Unlike ordinary water bags, the large screw-on cap provides a leak-proof seal, the large 1.65-inch bottle mouth is easy to fill and pour, and the wear-resistant handle hook can be hung on your backpack, easy to carry without hurting your hand.