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Item # MSREA201

MSR TrailShot MicroFilter

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MSR TrailShot MicroFilter

By Steven

Enwild Gear Specialist

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Another innovative offering from MSR, the TrailShot Microfilter weighs just 5.4 ounces, has a flow rate of 1 liter per minute, and effectively treats up to 2,000 liters of water. Perfect for backpacking, the filter is effective against bacteria, protozoa, and particulates.


Another innovative offering from MSR, the TrailShot Microfilter weighs just 5.4 ounces, has a flow rate of 1 liter per minute, and effectively treats up to 2,000 liters of water. Perfect for backpacking, the filter is effective against bacteria, protozoa, and particulates.

The filter utilizes Hollow Fiber Technology to maximize flow rate while also effectively neutralizing all but the most microscopic threats (NOTE: it is not effective against viruses). A simple squeeze action draws water from the nearest available water source through an integrated hose, and passes water through the filter, allowing you to drink safely immediately and directly from the integrated nozzle of the TrailShot. The field maintainable filter is incredibly easy to clean and requires no tools. Should you use the filter frequently enough to have treated 2,000 liters, the TrailShot Replacement Filter Cartridge (sold separately) is available to fully restore the filter’s effectiveness.

The full dimensions of the MSR TrailShot Microfilter are 6” x 2.4”, allowing it to stash conveniently in your backpack.

  • Pocket-sized and light at 5.4 oz. (153 g)
  • Drink directly from the source or use to fill bottles
  • Squeezing action fills 1-liter bottles in 60 seconds
  • Easy to clean: a few shakes helps restore flow rates in the field with no tools required
  • Meets NSF Protocol P231 for removal of bacteria, protozoa and particulate
  • Treats up to 2,000 liters with one cartridge
California residents: view proposition 65  Warning

Technical Specs

Best Use
Backpacking, Hiking, Running/Fitness
Field Maintainable
Filter Material
Hollow Fiber
Flow Rate
Up to 1 Liter per minute
Protozoa, Bacteria, and Sediment
Item Weight
5.4 oz
Item Dimensions
6" x 2.4"
Limited Lifetime
Up to 2,000 Liters

15 Reviews

4.6 / 5

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Robert B.


great for backup


bought to carry on day hikes for those "oops" times when I don't have water and need it if a source is available. Haven't used it except in the kitchen sink. works good


none as of yet

Fred S.


Trail runner. This is essential gear.


Compact. Fits nicely in my running vest and is very quick and handy.


Not ideal for backpacking. I use the larger for MSR Miniworks for that.

Heinrich S.


Compact lightweight filter


Great filter! The flowrate is good initially but with time it decreases and it takes some time to fill up a bottle.


The flow rate decreases with use and does not restore fully with cleaning.

Drew S.


Initial impressions: fast and lightweight


- doesn't take long to fill two 650mL cycling bottles - easy to use and lightweight for bike packing


- none so far, but have not used extensively in field

Perry L.


A Must Have In The Backcountry


I've been lucky over the years that I haven't gotten sick considering some of the water sources I've refilled from. - This thing is tiny by comparison to other filters I've carried backpacking which I'd never consider carrying while running. - While it's filtration is rather high tech, it's use is quite easy and requires no special training (if my dogs had thumbs, they'd use it too). - I have to say this is just another example of the top notch gear that MSR develops.


I've used it a few times over this past summer of running and haven't come up with any dislikes.



Better pumps out there


Weight Pump speed


Short hose for water access. Clogs very quickly.

Brett M.


Awesome little filter


Quick and easy


Hose could be longer

Paul D.


Best of Class.


Speed of filter, weight, ease of use.


Length of tube, cost of replacement filter after freezing.

John P.




I did a lot of research before buying this filter. To me nothing else was as convenient or easy to use.



Robert F.


Love this filter


Very easy to use and not too slow. My new go-to.



Romeo V.


The best water filtration I've used to date!!


Ease of use and maintenance. Fast and easy when you're on the go for your hikes. I only use my Sawyer mini as a backup now.


Filter replacement should be similar pricing to a Sawyer mini.

Brian P.


Quick water


Can get water out of a small area where some other filters need more water to quickly fill dirty reservoir. Light weight and relatively small


Can get tiresome trying to fill a large quantity of water. Pickup hose could be longer