MSR Guardian Purifier

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A Backpacker Magazine 2016 Editors' Choice winner, the MSR Guardian Purifier physically removes viruses, bacteria, protozoa and dirt quickly and easily on backpacking trips and international travel.

  • Features

    • Winner of both Backpacker Magazine's 2016 Editors' Choice Award and Outside Magazine's 2016 Gear of the Show Award
    • Unlike conventional hollow-fiber technology, the advanced medical-grade fibers in the Guardian block viruses—something most other hollow-fiber filters cannot do
    • Physically removes viruses, bacteria, protozoa and particulate, including hepatitis A, E. coli, giardia, cryptosporidia and more
    • Purifies 2.5 liters per min.
    • With every stroke, the purifier uses 10% of its water to flush the contaminants in its filter back into the source; this means you'll never have to hassle with back-flushing
    • Rugged construction is designed to withstand freezing and drops up to 6 ft.

    Made in USA.

    View all MSR Pump Water Purifiers
  • Technical Specs

    Best Use



    Filter Type


    Filter Medium

    Advanced hollow fibers


    Protozoa, Bacteria And Viruses

    Pump Force

    4 pounds

    Pump Strokes per Liter



    2.5 liters per minute

    Housing Material


    BPA Free


    Field Cleanable



    8.2 x 4.7 x 3.5 inches


    1 lb. 1.3 oz.

  • Reviews
    165 reviews with an average rating of 4.1 out of 5 stars

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