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SteriPEN Adventurer Opti

4.666666666666667 out of 5 stars
6 Reviews



Pen mightier than bacteria.

Destroy harmful waterborne bacteria in your water with the Hydro-Photon SteriPEN Adventurer Opti. The SteriPEN uses UV light to kill giardia, cryptosporidium, bacteria, and viruses in just a few seconds, so you can stay hydrated on the trail without having to worry about getting sick. And at a scant 3.6 ounces and 6 inches long, the Adventurer Opti won't weigh you down or use up a ton of valuable pack space.


  • Lightweight SteriPen purifies water on backpacking trips
  • Stir UV light in 1 or 1/2 liter of water for 90 seconds
  • Destroys 99.9% of viruses, bacteria, and protozoa
  • Runs on two included CR123 batteries
  • Replaceable lamp works for 8,000 treatments
  • Item #HYD0017
Purifying Element
UV light
Lamp Life
8,000 treatments
Claimed Weight
with batteries 3.6 oz
Recommended Use
hiking, camping
Manufacturer Warranty
limited lifetime

Overall Rating

4.5 based on 6 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 0 reviews
5 Stars - 5 reviews

What do you think about this product?


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5 out of 5 stars

January 25, 2024


I used this after purification with my be free if any of the water was stagnant. I mostly hike in Montana with beautiful bodies of water but on occasion I need it.

Christopher K

Originally reviewed on

5 out of 5 stars

November 20, 2023

Pretty darn good

I took this on a 21 day trip to Nepal and up to Everest Base Camp. I treated about 10-12 liters a day and had to swap out batteries after about 15 days. I was using Energizer Lithium Ultimate batteries for the trip and I think I got the expected life out of them. I wish 2 things were different: 1. I wish that there was an indicator light on the top, or somewhere else visible, to indicate that it was working or that it had failed because I pulled it out of the water. Its current placement makes it difficult to see the red LED because it's submerged in the water and impossible to see thru a Nalgene covered in stickers. Same goes for the UV wand itself.. very difficult to see except for when indoors or once the light got low in the sky. 2. The offset/asymmetrical wand cover made it difficult to operate in the dark or by feel. Chances of breaking the wand would also decrease if the wand was centered instead of off-centered. Neither of us got sick from anything waterborne so all in all it was a big win.

John C

Originally reviewed on

5 out of 5 stars

June 3, 2021

A must have for backcountry adventures

Light and portable, easy to use, no more pumping and clogged filters. allows you to travel light and fast.

Jennifer L

Originally reviewed on

5 out of 5 stars

September 12, 2020


6 trips and no vomiting or diarrhea!!!! Easy and simple to use. Even the lost hiker I encounter was able to use it.

Kealii K

Originally reviewed on

5 out of 5 stars

August 13, 2020

Light, compact and never failed

Worked great for treating water. No chemicals, worked every time I needed to treat water. Highly recommend over drops.

James S

Originally reviewed on

3 out of 5 stars

July 16, 2020

Fantastic...with important caveats

I've put it through the wringer

I've used my SteriPEN on trips including all-day climbs (Snakedike on Half Dome), week-long family backpacking trips, and months-long international trips to Micronesia. I haven't gotten sick once, though I have had to resort to boiling water and/or using chemicals (MSR's AquaTabs) when my SteriPEN's batteries wore out prematurely. Used according to the instructions, I have high confidence in the efficacy of the device. It's fast, convenient and light (lighter than anything other than chemical treatments, as far as I've found). The problem is that the batteries are expensive, hard to come by in most small US towns, and completely unavailable in many remote international places. Worse, in my experience, I found the number of treatments for every 2 batteries (the SteriPEN requires 2 cr123, 3.0 volt batteries) to be highly variable and strongly affected by cold temperatures. Note that reduced water clarity will have a substantial effect on treatment efficacy! In a pinch, you can let your water sit over-night to let suspended sediments settle out. It's a pain, but better than getting sick. I still rely on my SteriPEN, but I'm careful to check the condition of the batteries before heading out, and pack extras as well as AquaTabs. One other note: You essentially HAVE to use a wide-mouth 1 liter Nalgene as your water bottle--anything else is impossible to use with the SteriPEN or so difficult as to compromise the water treatment you're getting. I like using a hydration pouch for many outdoor activities, and this imposes an additional hassle, weight and volume.