SimPure Gravity Water Filter, Portable Water Filter Survival with 3L Gravity-Fed Water Bag, Tree Strap, BPA Free… Price: $29.99 (as of 10/20/2021 11:32 PST- Details)

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MULTI MODES DESIGN: Our water filtration system camping comes with an expansion interface for connection to a variety of beverage bottles for different people use and with an added 29.5-inch extension tube that allows drinking rivers, ponds, streams, or any water source directly. A shut-off clamp to achieve ready-to-use water production from hanging gravity bag, very convenient to use.
LONG LIFESPAN & CONVENIENT: Our hiking water filter straw up to 5,000 liters (1320gallons) of water purification for a family of four for 3.5 years. Gravity-Fed portable water purifier, convenient carry handle, weighs just 2.8 ounces, just hang from the tree or other support to get pure water. The water filter lifespan can be extended by clean water backwashing.