10 Best Backpacking Water Filters and Purifiers of 2026
Make backcountry water sources safe to drink
What are the best backpacking water filters and water purification systems? That really depends on the quality of the water you need to filter or purify, the number of people you need to treat water for, and your personal preferences. For example, squeeze-style water filters, UV purification, and filter bottles tend to be good for solo users and clear water sources, while chemical purification and pump filters/purifiers are good for larger groups and riskier or murkier water sources. Cost and filter longevity are also worth considering.
| Make / Model | Type | Price |
|---|---|---|
| Sawyer Squeeze | Squeeze Filter | $65 |
| Platypus QuickDraw | Squeeze Filter | $40 |
| Katadyn BeFree 3L | Gravity & Squeeze Filter | $80 |
| Aquamira Purification Drops | Chemical Purification | $16 |
| Platypus Gravity Works | Gravity Filter | $135 |
| Katadyn Hiker | Pump Filter | $90 |
| Steripen Ultra | UV Purification | $130 |
| Grayl Geopress | Squeeze Filter | $100 |
| HydroBlu Versa Flow | Squeeze Filter | $23 |
| MSR Guardian | Pump Purifier | $400 |
Here are the best backpacking water filters and water purification systems we recommend for backpacking, hiking, and camping.
1. Sawyer Squeeze Water w/ 2L CNOC Squeeze Bottle
2. Platypus QuickDraw Water Filter System
3. Katadyn BeFree Water Filtration System
4. Aquamira Water Purification Drops
5. Platypus Gravity Works
6. Katadyn Hiker Water Filter
7. Steripen Ultra UV Water Purifier
8. Grayl GeoPress Water Purifier Bottle
9. HydroBlu Versa Flow Water Filter
10. MSR Guardian Purifier
How to Choose a Backpacking Water Filter or Purifier
Many natural water sources contain microscopic organisms that can cause illness in humans. Most water filters intended for backcountry use will remove bacteria and protozoa, including giardia and cryptosporidium from these water sources. This is usually sufficient in the United States, Canada, and the UK.
- Viruses, often found in international water sources, are hard to remove because they are so small. Finer-grained filters called water purifiers are needed to remove them. They also can be neutralized with chemical purification agents such as chlorine dioxide or ultraviolet light.
- Hazardous minerals and chemicals, including fertilizers and heavy metals, are difficult to remove using most of the solutions listed below which specialize in removing biological contaminants. If you need water in places where such contaminants are present, your best bet is to switch to bottled water or to only drink from safe sources based on local information.
There are a wide number of different water filter and purifier types available. Unfortunately, none of them are foolproof or perfectly suited for all kinds of trips and locales. They also differ in ease of use, the length of time it takes for them to process water, and whether they’re good for solo or group use.
Here’s a summary of the different types of water filters and purifiers and their strengths and weaknesses, with several examples to illustrate the available products in each category.
Squeeze Water Filters
Squeeze filters are single-stage filters that are good for removing bacteria and protozoa, but not viruses. They’re best used with clear water sources that are low in particulates and suspended organic matter to prevent clogging. Processing speed depends on the size of the “dirty” water bottle coupled with the filter and how much pressure the user exerts to push water through it. However, squeeze filters typically slow down with use and must be back-flushed with a cleaning syringe regularly to maintain their flow rate. Some examples:
Gravity and Inline Water Filters
Gravity water filters make it possible to process larger quantities of water at once using the power of gravity. A large water reservoir, called “the dirty bag” is hung from a tree with a hose leading to a water filter. The output of the filter flows out another hose to a clean reservoir, called the “clean bag.” A squeeze-style, single-stage filter is typically used. Gravity filters are good for couples and small groups. An inline water filter uses a similar setup, but the user sucks on the output hose rather than running it to a clean bag. Some examples:
- Platypus Gravity Works 4 Liter Water Filter System
- Katadyn BeFree 3 Liter Gravity Water Filter System
- Sawyer 1 Gallon Gravity Filter System (designed for inline filter use)
Bottle and Straw Water Filters
Bottle and straw filters usually use the same single-stage, hollow fiber filters used by squeeze, gravity, and inline water filter systems. The user sucks water stored in a bottle or directly from the water source through the filter, rather than transferring it to secondary storage. They are best used by individuals in places where water is abundant. Some examples:
Pump Water Filters and Purifiers
Pump water filters filter out bacteria and protozoa, while pump water purifiers can also remove viruses. They have hand pumps that force water through the filter and out to secondary storage for future use. While pump filters do require some elbow grease to operate, they usually filter water quite quickly and are suitable for use by couples as well as individuals. Most have a pre-filter at the end of the hose that you drop into the water source to remove particulates and organic matter. This can be very handy when you can’t actually reach the water source, like down a steep embankment. They can also be cleaned and replacement filters are usually available. Some examples:
Chemical Water Purification
Chemical water purifiers are available in tablet or liquid form. The best chemical ingredient is chlorine dioxide, which has virtually no taste or color and kills bacteria, protozoa, and viruses. Chemical purification is best used by individuals rather than couples or groups because it takes anywhere from 15 minutes to 4 hours to fully purify water, far longer than other methods. While it is very lightweight, it is relatively expensive when compared to other methods. Many hikers carry chlorine dioxide as a backup to a second primary filter or purification method, as a result. Some examples:
Ultraviolet Light Water Purification
Ultraviolet Light is an effective form of water purification that neutralizes bacteria, protozoa, and viruses. It is best used with clear water since it doesn’t remove any particulates or organic matter. While UV purification is relatively fast, it’s not good for processing large quantities of water. It also depends on working batteries, which can run out of power. Still, it’s one of the few options that works well for cold water when there’s a risk of freezing a filter or purifier and ruining it.
Some examples:
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I bought a meter of 6mm ID / 8mm OD silicone tubing and a plastic shut off clamp. Then I drilled a hole in a plastic bottle cap and forced the tubing through it a centimeter or so. The bottle cap screws onto the end of my 3L CNOC dirty water bag. The silicone tubing slips over the intake end of my HydroBlu Versa Flow filter. A SmartWater bottle will screw onto the output end of that. It makes an awesome gravity filter!
I store it rolled up and stuffed into a cut off regular size one liter plastic bottle, which also serves as my scoop. I have a piece of pantyhose in my kit which can be used as a pre-filter if I’ve scooped up water with leaves and larger debris in it.
Including a couple pair of heavy duty nitrile gloves and a roll of Teflon tape, the whole setup weighs 10.88 oz.
The HydroBlu Versa Flow has been my go-to filter for years. The most reasonably priced filter on the list with decent performance. I use it in combination with a 2L CNOC bag to make a lightweight gravity system.
Same! I bought it wayyyyyy back when Philip first reviewed it and I really love it. I’d gone through two Sawyers that got mold issues after I wasn’t too good about making sure they were dry before storing for the winter, and I love that the Versa has the little window where you can see if there’s still moisture in it. Plus the way it attaches so easily to the CNOC and my Platypus 1L “bottles” is really terrific – no squeezing involved, just hang it from a tree and forget about it for a few minutes and voila, clean water!
Also: the CNOC bags with the ziploc-type opening at one end are, IMHO, an absolute necessity. I had big issues trying to fill either the Sawyer bags or my narrow-mouthed Platypus bottles (when I was just using chemical treatment) in standing water, especially if the water was very shallow. CNOC bags were a game-changer and several of my friends have bought them at my suggestion. (I myself bought one when I saw an AT thru-hiker with one and was like, WANT.)
I have tried most of the filters mentioned and have settled on the HydraPak
Flux 1.5 L Collapsible Water Bottle + Filter Cap – 50 fl. oz as the perfect solution. It has the speed and convenience of the BeFree but is much more robust. The BeFree is leak prone (and I have used them a lot!). The Sawyer is all right, and very popular, but I find it slower and more awkward to use. The HydraPak is basically a better BeFree. I can filter water so fast our group hardly has to pause, unlike gravity filters. I use my 3L hydration bladder to get unfiltered water up to camp, then filter it with the HydraPak to cook and drink. Again, speedy and efficient.
I think the hollow fiber type filters are great, but I do a very fast backflush of just a few ounces after every use. I use a flip top lid on a disposable water bottle for that, not the syringe, takes less than a minute. Use this with a gravity system. In my case, it is a Sawyer Double Threaded Mini, it essentially is a smaller Squeeze model filter. The frequent backflush really helps keep it working well.
I also do a robust backflush at home with tap water after a trip and again before a trip to make sure everything is working well. And store it capped with dilute chlorine bleach in it, the backflush before a trip is needed to flush that out. After a few months of use over several years, it still works as good as new.
I put together my own gravity system with a pair of Evernew 2 liter bladders and plastic tubing from the hardware store. A spare threaded coupling and the cut-off top from a soda pop bottle serves as a funnel to fill a bladder with unfiltered water.
I have met other backpackers on the trail that have poor performance with these hollow filament filters, but when I ask how often they backflush them, the answer ranges from never to weeks ago.
I have three ceramic filters in storage, I can’t remember the last time I used them, the newer hollow filament filter has replaced my ceramic ones.
I haven’t used any of my ceramic filters in years. I think I also have a new one, still in the box.
My first gravity filter used a Sawyer Mini. It was essentially the same process that I described in the first reply to this thread, although I think it used to different size silicone tubing. It worked as a great gravity filter, however I switched to the HydroBlu Versa Flow for faster throughput.
The Versa Flow doesn’t require a syringe to back flush. You just use your plastic bottle filled with water and squeeze it to back flush.
There aren’t any ceramic filters on this list…
Katadhn Be Free it is for me.
Tried the popular Sawyer and had nothing but clogs despite carrying those stupid syringes and other pieces.
In winter used to use those horrible Iodine tablets. I’m sure it was toxic waste for my body.
So far haven’t had any function issues with the Be Free. Easy to clean and use. Carry a small cut off end of a water bottle for a scoop in a small bag .
The whole kit with 3.0 liter bladder, filter ,long hose , shut off valve,scoop and bag weighs 7 oz.
Hope this helps.
I think the latest sawyer is faster than ever, actually. Does yours have the new white cap on top?
Are you now using the Be Free filter in winter instead of Iodine? (That’s how I’m reading your post but not sure that’s what you mean?). If yes, just be aware that any of the hollow tube filters will be compromised if frozen.
Philip wrote about it here: https://sectionhiker.com/can-you-use-a-backpacking-water-filter-after-its-been-frozen/
I see that the Hydroblu Versa Flow did not make the list. New issues?
It’s on here. Look again.
I trek the seven continents, so virus, heavy metals and pesticides removal is a priority. Nothing delivers clean, taste-free water better than my General Ecology First Need Elite.
Yes it old technology, a combination of glass matrix/dialysis tech, activated carbon block and charged plates. Indeed it does not self-clean while pumping, it is relatively heavy, cumbersome and prone to freeze damage. This said, it’s performance is superior to the Guardian featured here in terms of what matters to me: clean water.
The First Need deserves to appear on this list and possibly a place in your gear room.
It used to. In fact, it was the first water filter I ever owned. And I loved it until one of the hoses split three days from the nearest road. In addition to freezing and not self-cleaning (which are pretty important) the other reasons it ranks under the Guardian are several fold. First, it’s very difficult to buy since so few retailers carry it. The glass matrix technology is very difficult to understand compared to the guardian filter element which is very mainstream hollow tube technology. Another big factor is cost of ownership. A first need filter has an expect lifetime of 720 liters, vs the guardian which lasts 10,000 liters. Some people also care about pore size, which is .04 microns on the first need and 0.02 microns on the guardian. I loved my first need, but I’d use the guardian today if I wanted a pump purifier.
I won’t convince. But here’s a piece of hidden knowledge.
General Ecology used to promote sub-0.10micron retention but years later changed to 0.4. This was before Guardian emerged as an alternative.
I was concerned because only <.1m is true purification, as virii get through any larger. So I called GE and eventually got an engineer who actually knows the product. It's not remunerative as their profitable customers are airlines, aerospace, military and government on much larger devices.
We went through all the specs for FirstNeed and this engineer didn't try convincing me. We just discussed the facts deep into the weeds and I concluded the FN eliminates just about everything harmful including cesium 137 and other nucleotides. It does not remove salt water constituents. FN performs better than the Guardian specs and that's important to me because I've received near-death food poisoning (rural Russia and others) and want to improve my odds with water. I then learned that GE switched to the 0.4m retention claim while still promoting itsts product as a true "purifier" only on advice of its lawyers after being threatened by a crazoid.
I use a longer length of tubing and glue two nickles to the float because I want the float to hover deeper when drawing water.
Otherwise, your points militate against FN. You're correct. I could have easily purchased Guardian with what I spend on FN canisters. But I prefer the best filtration I can find.
Always in the market for an even better performer. One that also renders sea water drinkable and takes up a pound would resolve hella lot of my coastal trekking problems (looking at you, Oz).