NSF/ANSI Standard —99.999% Virus, Bacteria, Parasites & Microplastics Removal|3-in-1 Modular|20ml/s Instant Purification|Backwashable|
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Struggling to sip from outdoor streams? Tap water with that harsh chlorine smell or metallic pipe taste? Dehydrated on the trail with no clean source in sight? Traveling to remote regions and worried about hidden germs? Wherever you go, clean water shouldn’t be a constant worry.
One OASSAY FlexFlow removes 99.999% of viruses, bacteria, parasites & microplastics — boil, fetch, and purify water anywhere with its 3-in-1 modular system.
Remove, Absorb, and Reduce for Superior Taste. Eliminates 99.999% of viruses, bacteria, parasites & microplastics, while cutting chlorine, odors, and hardness. Each stage works independently for maximum filtration, delivering cleaner, fresher water with every sip.
Next-generation water purifier, lab-tested for exceptional quality. Powered by NanoFlex Carbon + 0.1 μm micro-membrane for consistently pure and great-tasting water.
Built to meet NSF standards, FlexFlow’s cartridge delivers lab-proven safety you can trust — clean in every sip, pure in every place.
OASSAY’s water purification and filtration testing is conducted through a dual testing mechanism involving third-party independent laboratories (including internationally accredited bodies such as SGS) and OASSAY’s in-house testing facilities. For every production batch of materials and filter cartridges, no less than 5% of samples are randomly selected for testing to ensure strict compliance with OASSAY’s rigorous quality standards. This report fully discloses the testing data from our third-party laboratory partnerships to uphold transparency. Download the complete Performance Data (PDF)
Winner of the 2025 Golden Pin Design Award
We’re excited to share that OASSAY FlexFlow has recently won the 2025 Golden Pin Design Award! This recognition highlights our innovative modular design and exceptional user experience, solidifying FlexFlow as a leader in outdoor hydration systems.
No water is too dirty, no source too extreme. Watch OASSAY FlexFlow turn murky, contaminated water into crystal-clear, safe drinking water. Viruses, bacteria, parasites, microplastics — all gone, instantly.
OASSAY FlexFlow isn’t just another water bottle. It’s a modular hydration system that adapts to your every need. With 3 Modular Modes for Ultimate Flexibility.
You’ve planned a peaceful solo camping trip, dreaming of cooking under the stars. Your gas canister, mini stove, and utensils are packed—not heavy, but bulky. And honestly? You could leave any behind… but water is non-negotiable.
Choose your cup—nestled perfectly around the bottle: the Titanium Cup for boiling over a fire, or the BPA-free PP Cup for mixing supplements. Both add zero extra bulk. And when the campfire crackles, FlexFlow delivers 99.999% pure water you can trust.
Bringing a bottle on a bike ride? No problem—just pop it in the cup holder. But for a trail run through the forest, or even a quick jog around the city, how much water can you really carry without slowing down? A bulky bottle blocks your pace.
Made of collapsible silicone, it compresses when empty and clips easily to your running vest or belt.
Go ultralight: use the filter cartridge alone. At just 140g, it attaches to standard 28mm bottles or connects directly to a hose—making it perfect for sipping from streams or adapting to disposable bottles on long hikes.
Wonder when you’d use the filter on its own?
Imagine drawing water straight from a river, feeling connected to nature. Or screwing it onto a Coke bottle during travel—surprised by the perfect fit. That’s the freedom behind our design. Every part of FlexFlow performs, ready to adapt to your adventure.
Stop wasting time and money on constant filter replacements. You pay for just 1 FlexFlow but get the equivalent lifespan of 5 normal filters.
FlexFlow uses a fast backwash to clear out over 90% of clogging residues. Instead of replacing 5 separate filters, you just need one. That’s up to 300+ days of clean water from a single Oassay filter cartridge.
No waiting. No pressing. No hassle. A light squeeze is all it takes. From murky to pure — in just 1 second. Perfect for trails, travel, and emergencies.
Collect, squeeze, sip — pure water flows instantly at 20ml/s, making hydration effortless every time. Watch OASSAY FlexFlow outperform other filters in water flow speed. Dual-stage design—fast, smooth, and reliable filtration every time.
We put OASSAY FlexFlow to the test against other leading brands to show you the difference. From faster purification to superior filtration, our technology outperforms the competition. Experience hydration that’s faster, cleaner, and more reliable—every time.
Watch the OASSAY FlexFlow in action under UV light! See how it clearly transforms dirty water into clean, safe hydration in real time.
Our packaging is made from recycled pulp cardboard—minimizing environmental impact. It also doubles as a storage box for your cup, designed for reuse, so nothing goes to waste. Protecting the outdoors starts before you even step outside.
Inspired by the woodpecker, our cap design combines simplicity with nature-smart efficiency.
