SimPure Gravity Water Filter, Portable Gravity-Fed Water Purifier with 3L Bag, Tree Strap, BPA Free Survival Gear and Equipment for Camping Hiking Emergency PreparednessVery Versatile: Besides the gravity water filter system, the included filter can be used in many different ways. Use as a personal water filter, or add a 29. 5 inch extension tube for more distance drinking. Even connect onto a water bottle. Long Lifespan and Speedy Treatment Time: Our water purifier camping has a lifespan of 5,000 liters (1320gallons), for a family of four uses up to 3. 5 years. With a flow rate of 27 liters per hour, it wont slow