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  • Sidewinder purifier does away with pumping, chemicals, test strips, extended timekeeping and filters; leaves no aftertaste, will not clog and does not require lubrication
  • Sidewinder is simple to use: just fill the included 1 liter bottle with water, screw it onto the Sidewinder purifier, flip the unit over and start cranking
  • Small LEDs indicate when purification is complete; purifies 1 liter (32 fl. oz.) of water (cold or warm) in a minute and a half
  • Innovative SteriPEN system uses UV light rays instead of chemicals to purify water for drinking
  • Ultraviolet (UV-C) light rays safely sterilize clear water by destroying 99.99% of protozoa (including Giardia and Cryptosporidia), bacteria and even viruses
  • Long used by municipal water districts and bottling companies, low-level UV-C light treats water safely, and unit's light will not damage eyes or skin when used properly
  • SteriPEN protects you from risks that cause botulism, cholera, dysentery and typhoid, just to name a few
  • Operates best with clear water, but if that's not available, no worries—the SteriPEN prefilter clears particulates and debris from water
  • Prefilter fits the included 1 liter bottle and other water bottles with 63mm wide-mouth openings; pour source water through filter, and clean water enters bottle
  • SteriPEN UV lamp provides up to 8,000 treatments
  • Includes SteriPEN Sidewinder water purifier, prefilter, 1 liter water bottle and instruction manuals; water bottle is made with BPA-free Tritan™ copolyester


Since late 2008, all SteriPEN water sensors feature twice the electrode voltage�of older models. The increased electrical current flow allows proper function in water with low conductivity such as snowmelt and even mineral-free distilled water.

REI membership


Best Use Backpacking, Camping
Field Cleanable Yes
Weight 16.6 ounces
Housing Material Not applicable
Dimensions 8.6 x 5.5 x 3.8 inches
Pump Force Not applicable
Pump Strokes Per Liter Not applicable
Removes/Destroys Protozoa, Bacteria, and Viruses
Output 32 fl. oz. per 90 seconds
BPA Free Yes
Filter Type Ultraviolet
Filter Medium Ultraviolet light
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