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【Connect with Filter straw】 Compatible with LifeStraw, Sawyer, Membrane, and other common brands Filter Straw Filtration System. Make your filter straw into an outdoor water purifier. 【Ultra Safe Material】: The gravity-fed water bag is made of food-grade, BPA-free, ultra-safe, and ultra-durable material to ensure safe and water all the time 【Large Capacity】: With 1.5 gallons of large capacity, the gravity fed bag can meet a family's or a large group's water needs during your outdoor activities. What's in box: 6L water bagx1, Adjustable Tree Strap, Detachable Tube Only the gravity fed water bag, NO filter straws included. Buy your favorite filter straws separately.