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Sawyer Mini Filter

3 reviews
5-star:   1
4-star:   2
3-star:   0
2-star:   0
1-star:   0

Very small, versatile, robust and high flow water…

Rating: rated 4.5 of 5 stars
Source: bought it new
Price Paid: $25 plus taxes


Very small, versatile, robust and high flow water filter system. This filter system fits in the palm of your hand, weighs nothing and has is rated to 100,000 gallons.


  • Small and lightweight
  • Robust
  • High flow rate
  • Easy to clean
  • Great with bladder/hydration packs


  • Pouch may develop leaks
  • Will freeze up in cold weather unless protected
  • No adaptor for Nalgene bottles
  • No carry bag

I'm writing to express my enthusiasm for a new Sawyer SP128 water filter device that I tested while hiking in the Adirondack mountains this past weekend.  I'm an avid mountain climber and my hikes will often consume 8-10 hours per day or take a full weekend with an overnight camp.  As such, I always take great care to be prepared.  

One of the elements I always carry is a water filter.  I have numerous types of Katadyn and MSR filters, all of which work great, but each takes up a good chunk of space in my pack and each requires effort to pump 2 liters of water (which is the size of my hydration bladder).  At times, after a lengthy hike, the effort to pump 2 liters can take quite a bit of energy.

On seeing the Sawyer SP128 system, I marveled at the size and the tech specs and wondered if it really could do the job that the packaging stated.  As I use a 2 liter bladder, I could not see how it could work for me until the EMS store clerk pointed out that the SP128 screwed onto most bladder systems or could be retrofitted to any bladder system with the SP110 adapters.  I quickly discovered that my "WLP" bladder system was not compatible but could do so with the SP110 adapters.  I bought the SP128 and SP110 adapters.

I flushed the filter out as per manufacturers instructions and then set about testing the filter before my ADK hike. I filled the 16 ounce bag with tap water, attached the filter and then squeezed the water from the bag into my Nalgene bottle. I was quite surprised at the high flow rate that the filter allowed.  I was able to squeeze the water out of the bag within 20 seconds.  Not bad for 16 ounces and faster than my other filter systems.  

I then attached the straw to the filter and then sucked the water from my Nalgene bottle.  Again, the flow rate was quite acceptable.  I then tested the black flushing mechanism - which was simply filling a syringe with water and then attaching it to the filter in reverse and then flushing.  Again, simple.  I could not tell whether this really worked - so I have to trust the manufacturers instructions for repeating the flushing two or three times with fast flushes.

With trepidation I did the unthinkable and cut the hose on my hydration bladder and then pushed the SP110 adapters into the tube ends.  This was quite hard and it told me that there was a good seal. I then screwed the SP128 filter onto the adapters, filled my bladder and tested by sucking through the tube.  I was very pleased to find that it did not added any more effort to suck water from the bladder system, nor did I see any sign of water leakage from the adapters.  

My ADK hiking trip this weekend targeted the "Lower Great Range" 27Km and 5 ADK peaks.  This trip took 10 hours and we experienced snow and chilling high winds.  Prior to our ascent to the peaks I filled the bladder from the stream at Lower Ausable Lake, knowing that I would drink lots of water as we climbed. I was now committed to using this new filter and I hoped that (1) The filter would do its job (for obvious reasons) (2) The adapters would not leak over the duration of my hike (didn't want wet clothes or food on this particular journey).

As we climbed and crossed each peak, I drank from my bladder - forgetting that I had fitted the SP128 filter inline on my bladder.  On Armstrong Mountain Peak I noted that my drinking tube was freezing.  In all my winter climbing, this was a first.  I then remembered the SP128 filter and was pleased that I had attached it at the lower end of my drinking tube and it was buried in my pack.  I believed that it would have likely iced up has it been exposed.  

At the end of my hike I checked the filter and adapters - no leakage and they had withstood being jostled around against all the other items that I had in my pack.  On returning to my motel I was able to easily and flush the filter and it dried overnight.

I was extremely pleased with this system.  I have now deleted a larger and heavier Katadyn / MSR filter from my pack.

After I returned from my trip, I disconnected the filter from the adapters and screwed them together and tested them for leakage.  I was pleased to see that they made a water tight connection.

My initial thoughts for the SP128 filter are:


  1. Small and lightweight and appears to be quite robust.  All great values.
  2. Quick to flush and quick to dry
  3. Easily adapted for non compatible Hydration systems 



  1. Though not experienced by me - several reviews indicate the pouch may develop leaks.  This is quite plausible as you have to squeeze the pouch while it is full of water.
  2. I'd like to see an adapter for the Nalgene bottles with the small opening as this would allow you to carry a Nalgene bottle with the filter attached -  for me this promotes mobility and saves holding the filter and straw while holding a Nalgene bottle.  I do realize that the filter screws into the commercial plastic water bottles - but I will never carried these flimsy bottles on my hiking activities.
  3. The SP128 system I bought contained a filter, straw and 16 ounce squeeze bag.  There was no carry bag.  This is a significant oversight in my opinion.  I will purchase a small bag from a local store to keep these items secure and together.


I am a Scout leader and teach outdoor skills.  For the last three years I have been demonstrating to youth and adults how to make portable water from back country sources.  I have developed an educational program that covers (1) learning about pathogens in back country water and (2) Practical hands on experience with different filtration/purification devices for (3) Solo/Group activities.  

I have lots of different pieces of equipment for this program - but not a Sawyer water filter system.  After personally trying out this water filter, I am going to get another system and add it into my program as a teaching aid.

I bought my system from the EMS store in Lake Placid for $25 plus taxes. A very reasonable price. EMS did not carry the full line up of Sawyer filters, but were pleased to answer questions and order for me anything that I wanted. Because the clerk was able to help me figure out how to use the filter with my hydration system, it was clear that the staff knew their stuff.  Pretty good service.  

I checked on Amazon and note that the costs for Sawyer filters were slightly higher than EMS (not including shipping) - but more significantly, you could buy them in packs of two with better pricing.  This suits me as I can have an inline filter on my bladder system and then have another filter for a teaching aid or a portable system for filling up Nalgene bottles if I were hiking in a group.


Very pleased with my new filter. I can see it becoming established as a filter of choice for my upcoming ADK hiking activities.

Jason Ruff

Good review. I just purchased one of these and I am looking forward to putting it through the paces.

6 months ago
Joseph Renow

Have you tried back-flushing by simply reversing the flow through it?...I have the larger .02 filter and simply run the filter in reverse about every 20 liters or so...as far as I can tell my flow-rate has never dropped and I was able to dispense with the syringe.

6 months ago

Does this filter require a flowing water source? The biggest problem that I had with my Sawyer Squeeze filter is that I often have to take water from the ground and could not get the water into the bag. I have had to continue using my pump filter on many occasions because of this, and therefore can't depend on the Squeeze.

6 months ago
Paul Young-Davies

Hello DennyBarr. This filter does not require running water. Simply take the 16 Ounce bag and dip it into the water. You should try to fill the bag completely and try to not get any sediment in the bag as you do so (may be difficult as you are likely reaching from the waters edge). Once the bag is full, screw on the SP128 filter and then invert and gently squeeze the bag to push the water through the filter. If you are near flowing water, then this will help fill the bag faster and reduce the chance of sediment. There is a larger filter SP131 which also comes with larger pouches. I simply went with the SP128 as I like the small compact size and I have a need to be as light and mobile as I can when doing lengthy Adirondack hiking. Hope this helps. Paul

5 months ago

A compact and simple water filter that is very adaptable.

Rating: rated 4.5 of 5 stars
Source: bought it new
Price Paid: $25


A compact and simple water filter that is very adaptable.


  • Very light, weighs (1.4 ounces)
  • Compact
  • Simple
  • Easy to use
  • Very cheap


  • Must be protected from freezing
  • Doesn't kill virus

I purchased the full size Sawyer filter and didn't even realize this mini version was available.  I was so happy with the bigger model that I bought this one as soon as I saw it in the store.

I have had several different filters over the years and always hated the pumping of my Katadyn.  It felt like a chore and that is why I'm in the woods, to escape all the work of daily life.  I was also so turned off by the UV purifiers and the need for batteries and the relatively fragile construction of those units.

When I saw the squeeze filters and that they didn't require cartridge changes, I was instantly interested in making this my new water filtration method. 

I'm not sorry that I did.  I bought this at a local retail store and paid the full retail price for it. I like to support the local shops and am fine with paying retail for the services they provide me. The price was only $25 and it comes with everything needed to put the filter to use and maintain it. 

My first impressions of it were that this filter is so simple, light and idiot proof that I'm not sure why anyone uses anything different for filtration. The only reason for anything else is if you have a need or desire to kill viruses. This is just a filter and will not kill a virus. The weakest point of this filter is that you must not allow it to freeze. I keep it in a bag in my sleeping bag on those cold nights and in my jacket through those cold days.

I backwash this filter regularly using the provided syringe and it is really easy to do.  Simply fill the syringe and pit it on the output end of the filter and quickly push the water through the filter. They recommend a quick burst of water to dislodge the stuff from the membrane and flush the unit.  I have found that after flushing the filter, it can be more difficult to squeeze water through for a bit of time.  After some use though the water starts to flow as normal and is relatively easy.


Love this filter. Started as a backup that I kept…

Rating: rated 5 of 5 stars
Source: bought it new
Price Paid: $19.99


Love this filter. Started as a backup that I kept in my pack. I now use it all the time. Great value.


  • Easy to use
  • Lightweight and compact
  • Convenience. Fits on most regular bottles


  • Must back wash often

This is a great filter for use as a backup or a main. Compact and lightweight. Includes one bag that rolls up or you can attach the filter to a regular water bottle. The water tastes great. Can squeeze water into a pot if needed.

I use it on all my day and multi day hikes. Not sure how it would be on a thru-hike, but I will take it and try it when I do the AT. Although, I will have drops just in case. Great product.

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