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Forget about wearing out your battery unless you have tennis elbow. The SteriPEN Sidewinder water purifier runs on elbow grease to destroy (their word, not ours) bacteria, viruses, and protozoa. The Sidewinder includes a one-liter Tritan BPA-free bottle and a SteriPEN pre-filter for use before UV treatment if water contains particles.

  • No battery to wear out
  • 1 liter is fully purified in just 90 seconds
  • Destroys waterborne bacteria, viruses, and protozoa such as giardia and cryptosporidium
  • Weighs just over a pound for easy carry
  • Lasts up to 8,000 1 liter treatments
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Great concept, not suited for backpacks

  • Familiarity: I returned this product before using it

I really wanted to like this. But the crank to power the bulb is inefficient and tiring to use. The entire set-up weighs over a pound, and if you take the bottle off to store water or drink out of, it leaves the bulb exposed. That said, if youre not using this in the backcountry, I'm sure it would work well enough. I just could not imagine mustering the energy to maintain 2rpm while on the trail, especially at altitude. I really hope there's a revision to the mechanics of this in the future, but until then, Im going to go with the steripen ultra to keep off batteries

I am the company rep for this item and I am really sorry it didn't fit your needs. You are correct, it isn't perfectly matched for backpacking, more for car camping or preparedness kits. There are some things in the works for these type of uses, but nothing for 2015. Glad you like Ultra!!! It is my favorite unit personally. Have a great summer!