Waterdrop Gravity Water Bag: Suitable For Camping, Traveling, Backpacking, ?Ultra Safe Materials?: The gravity water bag is built out of strong food-grade plastic. Manufactured with BPA free, ultra-safe and ultra-durable TPU material to ensure you can enjoy clean and safe water all the time. ?Versatile Uses?: Easily create a gravity-based water filtering system with the Waterdrop Filterstraw. Compatible with SAWYER water filter MINI Series, ect. Provide you enough reliable pure water anywhere, anytime. ?Outdoor Water Needs?: Fulfill all your outdoor water demands: hiking, camping, domestic and international travel, emergency preparedness (tornadoes, rainstorms, earthquakes, floods, etc.) to meet the emergency water demand in a variety of situations. Each bag only weights 0.29 pounds. ?Large Capacity?: With 1.5 gallons of large capacity, the gravity bag will keep you hydrated during your favorite outdoor activities. Share the freshness with the crew. ?Professional Filter Brand?: Top quality has always been our approach to water purification. We source our materials in accordance with the highest standards of the industry. Our professional team members vet every piece of the materials to ensure it meets those standards by researching ingredients, auditing sourcing practices, and testing products?all to make your shopping secured.