You can also read our Best Water Filters for Trail Running and Best Water Bottles for Running guides where we named this the best filter for runners. The soft bottle is collapsible, fitting easily into the pocket of a hydration pack or vest, and it's compatible with other soft bottles, adding to its versatility. The Katadyn BeFree 1 litre is a water filter connected to a lightweight and foldable 1 litre drinking bottle. THE BOTTLE OPTIONS | The Katadyn BeFree is only compatible (that is, you can only use it) with a collapsable Hydrapak water bottle with a 42 mm screw top. Please note: initial packaging incorrectly stated that this product meets EPA standards for virus removal.

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While it's not the most durable, it offers a fast flow rate that filters bacteria and protozoa, including Giardia and Cryptosporidium.

As we explore more remote terrain, or in hotter weather, finding clean, safe water for hydration and cooking becomes more and more important.Gently squeeze the flask for instant refreshment and maintain the EZ-Clean Membrane™ quickly and easily for longer life and more enjoyment. If you plan on going long distances with this as your only filtration system, we'd recommend carrying a second soft bottle in case the first one does leak or break, thereby defeating the purpose of ultralight. To get the most enjoyment out of your filter, simply shake or swish the EZ-Clean Membrane filter and hit the road.

Robust, versatile, and easy to use, these filters from LifeStraw would be a great option for walkers and climbers in busier UK hill areas where it may be particularly sensible to treat water sources with some caution, says Dan Bailey.

Water treatment products are in high demand for outdoor enthusiasts, international travelers, relief groups, and preparedness minded individuals. While our experience didn't yield a filtration system that didn't work, it's possible that it might happen.