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  • Easy to use: gently squeeze or turn upside down and watch the water flow through the filter; filters up to 2 liters of water per minute
  • Easy to clean: simply shake or swish to remove debris
  • Collapsible 0.6L flask packs small to fit into tight spaces
  • 0.1 micron microfilter is tested to protect against harmful organisms, removing protozoa (99.99%) and bacteria (99.9999%) to EPA standards
  • 43mm, wide-mouth opening makes for easy filling from any lake, river, stream or faucet
  • Cap over drink nozzle keeps dirt out
  • Tested to 1,000 liters; individual results will depend on water quality
  • Lightweight at just over 2 oz.
  • Need to filter large quantities of water? BeFree filter cap works with the Hydrapak Seeker 3L Reservoir (sold separately)
  • BPA free


View all Katadyn Straw Water Filters

REI membership


Best Use Hiking
Filter Type Squeeze, Bottle
Filter Medium Hollow fiber
Removes/Destroys Protozoa and Bacteria
Output 2 liters per minute
Field Cleanable Yes
Dimensions 9.1 x 2.8 x 2.8 inches
Weight 2.3 ounces
Rated 5 out of 5 by from Newest Hiking Staple Super simple + super light = new staple in my hiking kit Was looking for lightweight non-chemical water treatment for hiking in the states. After digging in on a few other products, I noticed this little gem in a review. Decided to give it a try as I had a few other hydrapak flasks with 43mm mouths and larger volume. Super happy with the performance on a few hikes so far. Easy to use and you don't notice it is there - it just works. Will be back to provide a more in depth review after a few months. Noticed there is a 3L bladder that is compatible, but would like to see other volumes available. It easily attached to my 750ML flasks, but I would like a 1L option.
Date published: 2016-06-19
Rated 5 out of 5 by from My go to! I purchased the BeFree initially for some short, local day hikes. My goal was to product test in a local atmosphere before utilizing on an adventure. Katadyn did not disappoint; the filter is great and tough and lasted on several 30+ mile treks. True to form, Katadyn has released an amazing bottle. Small enough to tuck in my waist band for a quick trail run and easy enough to fill and re-fill. I have purchased several more since the initial purchase for my family hiking, emergency etc. I have recommended this product to friends and they are impressed with the ease of use.
Date published: 2016-11-03
Rated 5 out of 5 by from The bomb This thing is awesome, I started out a little skeptical of the design but soon found out it works great for multiple reasons. I used this for my main filter on a five day canoe trip in the BWCA had no issues and found it extremely light and ready to pack in a pocket or in the bottom of a canoe. I thought it would be broken with the abuse I gave it, but just got back from a 7 day back country elk hunt and again used it as the main filter and again worked great. I am sold, this is the filter for me. Nice work Kaytadyn -Very handy -Light -Easy to use The bomb!!!!
Date published: 2016-11-02
Rated 5 out of 5 by from Super Convenient & Small I use this as backup filtration when backpacking and love the quick convenience. I don't like using my big pump filter because of the time and effort it takes, and this little bottle helps me get out the pump less often. When we come up on a stream or lake, I just dip the bottle in and get a quick and refreshing gulp of water without having to hold up the group by draining my hydration reservoir as quickly or taint the water and then have to wait with iodine or other chemicals. In my experience the filter has flowed very quickly and was easy to clean when it slowed.
Date published: 2016-11-03
Rated 5 out of 5 by from Just what I've been looking for I've been looking for an easy way to filter water on long mountain trail runs here in Bend, OR. This is perfect. I've now used it on about 7 long runs up to 28 miles without any issues. Quickly dip it in the stream and you're off within a few seconds. The water flow is great so no problems getting enough water. I usually have a hydration pack with me as well but barely sip from that as the fresh cold water from the local streams is more appealing. Given other peoples comments about quality issues, not sure I'd want to completely rely on this bottle, but I haven't had a single issue. If I were doing a multi day hike, I'd probably want two of these, just so I had a backup if something went wrong with one.
Date published: 2016-08-30
Rated 5 out of 5 by from Light, simple and so easy! I used this BeFree bottle for my week long canoe trip last month and it was awesome! The bottle is very light and made the trip so much easier than having to stop and pump every time you need a refill. This bottle made it about as easy as it could be: dip to fill the bottle, put the cap on, and drink. The bottle was very durable despite constantly being thrown in and out of the canoe during portages and at camp. I strongly recommend this bottle if you're looking for a water filter set!
Date published: 2016-11-03
Rated 1 out of 5 by from Katadyn BeEnslaved - too good to be true indeed. I bought this halfway through my PCT hike to replace the Sawyer Squeeze. Initially, I was extremely happy! The flow was ridiculously fast. A 1l bottle option would have been perfect, but I was still so fast at filtering. I was very diligent in cleaning it, but noticed after about a week (of intermittent use) that the filter slowed considerably. Thorough cleaning did not rectify the issue. The flow rate after only 2 weeks slowed to essentially unusable. I was extremely disappointed with this as I think it's faulty to design a product that needs replacing so frequently. Avoid this at ALL COSTS. It is too good to be true.
Date published: 2016-10-29
Rated 5 out of 5 by from The fastest, easiest, lightest filter I used this as my only filter for a three day two night backcountry trip that followed the Tuolomne River in Yosemite. All you do is dunk it in the water screw the cap on and drink immediately. This is the fastest and lightest micro filter that I've ever used. It's also maintenance-free. I will say that I got one of the first batch where the Hydrapak flask had a tiny leak from a faulty weld seam but they replaced it for free and the new one is perfect and the updated design fixed the initial problem. Well done Katadyn and REI!
Date published: 2016-11-02
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Will a freeze destroy its filtering function?

Asked by: knowWhentoFold
The filter included with the BeFree Water Bottle is a hollow fiber filter. Freezing temperatures will damage the filter.
Answered by: REIservice
Date published: 2017-05-26

Can this filter be attached to any other bottles or only this Katadyn bag? (e.g. the Sawyer Squeeze can be attached to Smart Water bottles)

Asked by: Bar2D2
It can also be attached to the Hydrapak Seeker 3L.
Answered by: Steggy
Date published: 2017-05-19

Does it filter out lead or other elements?

Asked by: scarlet biker
The BeFree Water Bottle and Filter Set does not remove lead from the water.
Answered by: REIservice
Date published: 2017-05-26

Will this system be also work well in Peru? I will be trekking Machu Picchu for 4 days and the tour company will be boiling our water. As a secondary measure I was planning to also bring a filtration system of my own because I have a sensitive stomach.

Asked by: ReJoyceJoyce
It should work fine for you in Peru. I've used Katadyn filters in Peru on previous trips and they've worked just fine. I just finished the Inca Trail last week and had no issues with the unfiltered boiled water (skipped the filter). Be advised that you'll likely consume 4-6 liters of water per day, so you may want to be able to swap the filter amongst a couple of bottles. For the first two days you can purchase water / gatorade from local vendors along the trail, so I'd recommend doing that. Helps the local community and you won't need to worry about getting sick. Last vendor is just prior to Dead Woman's Pass. 
Answered by: QuantumCat
Date published: 2017-05-26

To REI Service. Any info on differences between Katadyn BeFree & Sawyer Mini Water Filter? Pros & Cons of each would be helpful. I'd use it on backpacking trips in US (Sierras, PCT, etc.). I have used the Sawyer Mini on PCT. Thinking of trying Katadyn.

Asked by: Water Filter
Both filters are squeeze filters that are very versatile. They are very similar in how they function and they can both be used with a reservoir. The main difference is how the two filters are cleaned. The Katadyn can be cleaned by swishing it through water, but the Sawyer is cleaned by backflushing with the provided syringe. Additionally, the way the filters are used with a reservoir is slightly different. Choosing between the two may just be a matter of preference.
Answered by: REIservice
Date published: 2017-05-07

Do this filter norovirus?

Asked by: lau33
This water filtration system filters out protozoa and bacteria. Norovirus is a viral pathogen so it will not be filtered out.
Answered by: REIservice
Date published: 2017-05-26

Is the lower element of the filter meant to detach? Mine was knocked in my pack, exposing a gap that easily would have let unfiltered water pass through to the nozzle. Is katydyn planning a fix to this flaw? Is the filter usable if it's realigned?

Asked by: CABayHiker
We recommend taking the bottle back to any REI store for an inspection or contact Katadyn directly for troubleshooting assistance.
Answered by: REIservice
Date published: 2017-03-28

Can you use it to filter a larger quantity by squeezing into a larger container instead of packing the heavier KTDYN filter or is it real time consuming and messy? It look to be good for about 2000 liters if water source is not real dirty.

Asked by: Justaquestion
You can squeeze the water into a larger container if you would like. Additionally, the filter is compatible with the Hydrapak Seeker 3L Reservoir:
Answered by: REIservice
Date published: 2017-05-19
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