Whether you’re deep in the backcountry or on the road in your RV, the LifeStraw PeakFlow 3L gravity filter makes clean water a worry-free part of your journey. With its ultralight build and leakproof design, this system uses gravity to purify up to 3 liters of water in minutes.
- Simply fill, hang, and sip—no pumping required.
- Bag doubles as a leakproof storage unit or large squeeze bottle with the included cap.
- Filter connects to standard water bottles or works as a straw for direct hydration.
- 0.2-micron membrane blocks 99.999999% of bacteria and 99.999% of parasites, including E.coli and cholera.
- Removes silt, sand, microplastics, and cloudiness over 0.2 micron.
- Field cleanable and built with recycled materials for sustainable travel.
- Custom backwash accessory ensures steady flow over time.
- Certified to meet EPA and NSF P231 standards.
- Provides 3 liters/min with a lifespan of up to 1,000 gallons.
Perfect for those looking to buy an ultralight portable water purifier that performs reliably from trails to campgrounds.
Michael Stafford (verified owner) –
I’ve tried a few setups and honestly, this gravity filter is the easiest to use. Filled the bag, hung it, had drinking water in minutes!
James Carlson (verified owner) –
If you’re looking to buy an ultralight portable water purifier that actually works in rugged conditions, this is it. We use it for camping and RV trips alike.
Ernest Collins (verified owner) –
I read tons of LifeStraw gravity water filter reviews before choosing the PeakFlow—and I’m glad I did. It’s a game changer for our backcountry hikes.