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Review: Sawyer Mini Water Filter System

Sawyer MINI works well with the SmartWater Bottles
Average read time 2 min

We have been using the Sawyer Mini Water Filter System for almost a year now. Like all our reviews we use the equipment for an extended period of then critique it. Makes no sense to use it for a month and offer an opinion.

The Sawyer Mini Water Filter System is an ultralight, ultraportable, and very useful tool. The Mini lives up to its name, weighing in at about 2 oz. this beats other water systems. The Mini is also quite versatile. It can be used with its collapsible 16 oz. pouch, in line to with your hydration pack, and it even fits on some plastic water bottles. With its straw attachment, you can fill a container and drink right from the filter via the straw. With no moving parts or batteries, the filter is simple and reliable in the field.

We have been able to filter water from running streams, small water deposits, and draining rock walls. The Mini does need to be maintained and if you use it heavily, even on a long backpacking trip, you may need to flush it which is simple with its syringe. It only takes a minute and is worth doing. You should flush it before storing with fresh spring or tap water. The pouch should always be cleaned after use as per manufactures instructions which are on the pouch.

Mini Filter with Flushing Syringe
Mini Filter with Flushing Syringe Scott L. | copyright Challenged Hiking

With a 0.1 micron pore size in its hollow fiber membrane filter, the Mini is okay for most backcountry waters. The company states it removes bacteria, Protozoa, E. Coli, Giardia, Vibrio cholerea, Salmonella Typhi, and has a cartridge life of up to 100,000 gallons. However, it does not treat viruses.

Even though you can drink instantaneously from the systems pouch the Mini requires time for pumping into other containers. If you are used to larger gravity filter systems, the time required to fill your bottle with the mini may take a bit to get used to. Having said that, it really not a big deal given the trade-off for weight and space saved in your pack. The Mini is not best suited for large groups for the reason stated above (unless you have several). It is best used as a personal filter system.

Mini Filter with Pouch and Straw Attached
Mini Filter with Pouch and Straw Attached Scott L. | copyright Challenged Hiking

When I first opened the Mini I thought that the collapsible container was not going to last very long. It so far has proved me wrong. because of the hollow filter design, you’ll want to pay extra attention to it in the winter and protect it from freezing. You can buy replacement pouches and/or separate larger pouches at 32 oz. and 64 oz. The system is also sold in a pack of 4 for group use.

Sawyer Mini pouches
Sawyer Mini pouches Scott L. | copyright Challenged Hiking



  • Small
  • Lightweight
  • Easy to drink from
  • Can be used several ways
  • Inexpensive ($20 – $25)


  • Doesn’t treat large quantities well.

Any thoughts? Leave a comment!