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Details

  • Easy to use—press button to activate, place in water and stir; lamp turns off and an indicator signals when water is purified
  • Ultraviolet UV-C light rays safely sterilize clear water by destroying 99.99% of protozoa, including Giardia, Cryptosporidia, bacteria and even viruses
  • Protects you from risks that cause botulism, cholera, dysentery and typhoid, just to name a few
  • Optical sensor doubles as a convenient LED flashlight
  • Retail package includes 2 non-rechargeable (disposable) CR123 batteries and a neoprene case with belt loop
  • Device works with containers with minimum 1.75 in. diameter opening (i.e. Nalgene wide-mouth bottles)
  • One set of CR123 batteries will treat up to 50 liters of water
  • UV lamp life: 8,000 treatments
  • Small and lightweight, weighing just 3.8 oz. with batteries
  • SteriPEN Premium Lamp Life Pledge lets you register your purchase to receive a replacement SteriPEN after 8,000 uses; find details at steripen.com/pledge
  • Recipient of Backpacker Magazine's 2011 Editors' Choice Award

Imported.

SteriPEN water purifiers meet U.S. Environmental Protection Agency standards for microbiological water purifiers and have been independently tested by the Oregon Health Sciences University and the universities of Arizona and Maine. For complete test results visit www.steripen.com.



View all SteriPEN Ultraviolet Water Purifiers

REI membership

Specs

Best Use Backpacking
Filter Type Ultraviolet
Filter Medium Ultraviolet light
Removes/Destroys Protozoa, Bacteria, and Viruses
Pump Force Not applicable
Pump Strokes Per Liter Not applicable
Output 32 fl. oz. per 90 seconds
Housing Material Not applicable
BPA Free Yes
Field Cleanable Yes
Dimensions 6.1 x 1.5 x 1 inches
Weight Without batteries: 2.5 ounces
Rated 4 out of 5 by from Works for me I have used on 2 backpacking trips. Was using a pump before. Nice product. Works as advertised. Beats pumping. The indicator lights are hard to read if you are not in the shade, which is why I don't give it 5 stars, but this is by no means insurmountable (audible beeps would be nice). Batteries aren't cheap. You get (per the mfr) about 50 liters per set. I am not sure how this compares to the cost of replacing filter cartridges or using tablets/drops, but seems pretty similar. I have only used on clear alpine water sources, not murky water. Even for clear water, the prefilter is nice (also helps keep the bottle lid dry)
Date published: 2013-08-29
Rated 5 out of 5 by from works great! What can I say? I've used it several times out hiking. Less weight. Tastes great! And since the little buggers stay in the water, I get a little protein in my shake. My only concern is that it doesn't disinfect absolutely everything (e.g., the water around the rim from when I dip the bottle in the stream), but I haven't gotten sick when using this yet. Remember, you are not killing 100% of bacteria, just 99.999%, though I might be off a little. Because it's electronic, and therefore prone to failure (though it hasn't failed yet), it's a good idea to bring disinfectant tablets as backup. Also, don't forget spare batteries!
Date published: 2014-07-17
Rated 5 out of 5 by from Great way to go! My husband and I took this along for our honeymoon in New Zealand. We toured the South Island, car camping the whole way. Many of the campsites we visited had unfiltered water, we never ran into a problem and it was very easy to set up and use. It's just important to remember to bring a spare battery along. It can even be used as a light source if your in the dark and it's the most handy! Certainly beats boiling enough water, especially in warmer climates. On a three day hike, we even filled up along the way in rivers and had no problems. It's lightweight and easy to bring along. We are very happy with the purchase.
Date published: 2013-03-21
Rated 5 out of 5 by from Great product I am 52 years old and have been backpacking for nearly 40 years, mostly in the Appalachian Mountains, but some out West and overseas. Water treatment has changed a lot since I used drops of Clorox years ago! This little baby is easy to use, lightweight,and has not failed me in two years of use. I have taken it to numerous countries, and used it in dozens of water sources here in the States. No bleachy taste (tablets). Beats the heck out of pumping (and smaller than pumps, too). A great product whose price keeps dropping. I like it!
Date published: 2013-01-25
Rated 2 out of 5 by from Love the idea but unreliable I have taken my Steripen Adventurer Opti on 4 long Backpacking trips. It worked fine on my first trip 3 years ago. However, since then, I have been unable to keep batteries in this thing for even a one week hike. This year (2014), brand new batteries put in the night before a 9-day Wind Rivers trip and by day 4, everything was dead. I probably used it for a cumulative 15 minutes. I had tested the batteries prior to the trip and they were 100% (I had had the batteries die part way through a previous trip so I double checked). This would be one of my favorite tools if it worked reliably.
Date published: 2014-12-30
Rated 1 out of 5 by from Not worth the Hassle I had planned on using this filter system while thru-hiking the AT but it failed me twice with-in the first month of being on trail. There is no screen showing the battery life which resulted in the batteries to die on me twice while in the middle of the woods and had to drink dirty until I could make it into the next town. The batteries are expensive at about 10-15 a battery with it taking 2 batteries at a time. I originally liked it because of the lightweight of the unit but i ended up hating it and any hiker that wants to go on long distance hikes stay away from this product because it isn't if it will fail on you but rather when it will fail on you.
Date published: 2014-01-10
Rated 1 out of 5 by from Not reliable I have taken this on many backpacking trips only to find that I can not get more than 2 to 3 filtrations per set of batteries. While the pen is lite, which is why I bought it in the first place, it is not just worth the headache, and in reality you are not saving any weight because of the amount of batteries you must carry to make this thing last over a course of a trip. It is easier and more reliable to take my Katadyn hand pump that way I know I have a filter that's going to work and filter sediment from the water. This to me is worth the little extra weight. When I go to Nepal the SteriPEN is staying home.
Date published: 2014-01-07
Rated 4 out of 5 by from A very good option This is my second Adventurer. I lost the first one on long, bumpy glissade. Light and much quicker than pumping. Only problem is that it doesn't work in water of exceptional clarity: it thinks there's no water. I sent the first one back to Steripen to have the firmware flashed with a version which fixed this fault. I was very surprised to find that this unit, purchased years later, still shipped with the faulty firmware. The fix is to stir a tiny bit of dirt into the perfect water, but bummer. Nonetheless, I recommend it. Water of perfect clarity is quite rare.
Date published: 2014-09-12
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Will this work with the super lightweight 1L Vapur water bottle? Wasn't sure how the opening size compared with nalgene.

Asked by: nativeplantnut
Adventure Opti will work in about any container that is one liter or smaller as long as the bottle opening is at least 1.5 inches. 
Answered by: SteriPEN
Date published: 2015-09-20

Do you have to use a clear water bottle with this?

Asked by: SoCalGirl180
You do not have to use clear containers for the Adventurer Opti Water Purifier to work.
Answered by: REIservice
Date published: 2016-07-14

What kind of batteries does it use?  Does it have a usb option?  Is it waterproof?

Asked by: Deborah Dove
The Adventurer Opti Water Purifier uses 2 CR123 batteries. It cannot be charged by USB. The purifier is water resistant but not waterproof, so we suggest you avoid submerging the purifier.
Answered by: REIservice
Date published: 2016-08-08

Can you use this SteriPEN with a 1 L Nalgene bottle? Some comments mention 500 ml. Does this mean that you have to sterilize 1/2 L at a time in a half L bottle? Thank you.

Asked by: Happycamper38
Yes you can. All SteriPEN's can purify up to one liter of water (except the Freedom - .5 liter).
Answered by: REIservice
Date published: 2016-11-19

Can i add a flavor or electrolyte powder to the water after it has been uv treated with steri pen?

Asked by: bushwacker19
Flavor could be added to your water after being treated with the Adventurer Opti Water Purifier.
Answered by: REIservice
Date published: 2016-06-24

Does this SteriPEN work with the pre filter that the company also sells?

Asked by: madskeeper01
​The Adventurer Opti Water Purifier is not compatible with the SteriPEN Water Bottle Prefilter.
Answered by: REIservice
Date published: 2017-07-01
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Back to top

Please select a color/color.

Reviews

Rated 4 out of 5 by from Works for me I have used on 2 backpacking trips. Was using a pump before. Nice product. Works as advertised. Beats pumping. The indicator lights are hard to read if you are not in the shade, which is why I don't give it 5 stars, but this is by no means insurmountable (audible beeps would be nice). Batteries aren't cheap. You get (per the mfr) about 50 liters per set. I am not sure how this compares to the cost of replacing filter cartridges or using tablets/drops, but seems pretty similar. I have only used on clear alpine water sources, not murky water. Even for clear water, the prefilter is nice (also helps keep the bottle lid dry)
Date published: 2013-08-29
Rated 5 out of 5 by from works great! What can I say? I've used it several times out hiking. Less weight. Tastes great! And since the little buggers stay in the water, I get a little protein in my shake. My only concern is that it doesn't disinfect absolutely everything (e.g., the water around the rim from when I dip the bottle in the stream), but I haven't gotten sick when using this yet. Remember, you are not killing 100% of bacteria, just 99.999%, though I might be off a little. Because it's electronic, and therefore prone to failure (though it hasn't failed yet), it's a good idea to bring disinfectant tablets as backup. Also, don't forget spare batteries!
Date published: 2014-07-17
Rated 5 out of 5 by from Great way to go! My husband and I took this along for our honeymoon in New Zealand. We toured the South Island, car camping the whole way. Many of the campsites we visited had unfiltered water, we never ran into a problem and it was very easy to set up and use. It's just important to remember to bring a spare battery along. It can even be used as a light source if your in the dark and it's the most handy! Certainly beats boiling enough water, especially in warmer climates. On a three day hike, we even filled up along the way in rivers and had no problems. It's lightweight and easy to bring along. We are very happy with the purchase.
Date published: 2013-03-21
Rated 5 out of 5 by from Great product I am 52 years old and have been backpacking for nearly 40 years, mostly in the Appalachian Mountains, but some out West and overseas. Water treatment has changed a lot since I used drops of Clorox years ago! This little baby is easy to use, lightweight,and has not failed me in two years of use. I have taken it to numerous countries, and used it in dozens of water sources here in the States. No bleachy taste (tablets). Beats the heck out of pumping (and smaller than pumps, too). A great product whose price keeps dropping. I like it!
Date published: 2013-01-25
Rated 2 out of 5 by from Love the idea but unreliable I have taken my Steripen Adventurer Opti on 4 long Backpacking trips. It worked fine on my first trip 3 years ago. However, since then, I have been unable to keep batteries in this thing for even a one week hike. This year (2014), brand new batteries put in the night before a 9-day Wind Rivers trip and by day 4, everything was dead. I probably used it for a cumulative 15 minutes. I had tested the batteries prior to the trip and they were 100% (I had had the batteries die part way through a previous trip so I double checked). This would be one of my favorite tools if it worked reliably.
Date published: 2014-12-30
Rated 1 out of 5 by from Not worth the Hassle I had planned on using this filter system while thru-hiking the AT but it failed me twice with-in the first month of being on trail. There is no screen showing the battery life which resulted in the batteries to die on me twice while in the middle of the woods and had to drink dirty until I could make it into the next town. The batteries are expensive at about 10-15 a battery with it taking 2 batteries at a time. I originally liked it because of the lightweight of the unit but i ended up hating it and any hiker that wants to go on long distance hikes stay away from this product because it isn't if it will fail on you but rather when it will fail on you.
Date published: 2014-01-10
Rated 1 out of 5 by from Not reliable I have taken this on many backpacking trips only to find that I can not get more than 2 to 3 filtrations per set of batteries. While the pen is lite, which is why I bought it in the first place, it is not just worth the headache, and in reality you are not saving any weight because of the amount of batteries you must carry to make this thing last over a course of a trip. It is easier and more reliable to take my Katadyn hand pump that way I know I have a filter that's going to work and filter sediment from the water. This to me is worth the little extra weight. When I go to Nepal the SteriPEN is staying home.
Date published: 2014-01-07
Rated 4 out of 5 by from A very good option This is my second Adventurer. I lost the first one on long, bumpy glissade. Light and much quicker than pumping. Only problem is that it doesn't work in water of exceptional clarity: it thinks there's no water. I sent the first one back to Steripen to have the firmware flashed with a version which fixed this fault. I was very surprised to find that this unit, purchased years later, still shipped with the faulty firmware. The fix is to stir a tiny bit of dirt into the perfect water, but bummer. Nonetheless, I recommend it. Water of perfect clarity is quite rare.
Date published: 2014-09-12
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Questions & Answers

Will this work with the super lightweight 1L Vapur water bottle? Wasn't sure how the opening size compared with nalgene.

Asked by: nativeplantnut
Adventure Opti will work in about any container that is one liter or smaller as long as the bottle opening is at least 1.5 inches. 
Answered by: SteriPEN
Date published: 2015-09-20

Do you have to use a clear water bottle with this?

Asked by: SoCalGirl180
You do not have to use clear containers for the Adventurer Opti Water Purifier to work.
Answered by: REIservice
Date published: 2016-07-14

What kind of batteries does it use?  Does it have a usb option?  Is it waterproof?

Asked by: Deborah Dove
The Adventurer Opti Water Purifier uses 2 CR123 batteries. It cannot be charged by USB. The purifier is water resistant but not waterproof, so we suggest you avoid submerging the purifier.
Answered by: REIservice
Date published: 2016-08-08

Can you use this SteriPEN with a 1 L Nalgene bottle? Some comments mention 500 ml. Does this mean that you have to sterilize 1/2 L at a time in a half L bottle? Thank you.

Asked by: Happycamper38
Yes you can. All SteriPEN's can purify up to one liter of water (except the Freedom - .5 liter).
Answered by: REIservice
Date published: 2016-11-19

Can i add a flavor or electrolyte powder to the water after it has been uv treated with steri pen?

Asked by: bushwacker19
Flavor could be added to your water after being treated with the Adventurer Opti Water Purifier.
Answered by: REIservice
Date published: 2016-06-24

Does this SteriPEN work with the pre filter that the company also sells?

Asked by: madskeeper01
​The Adventurer Opti Water Purifier is not compatible with the SteriPEN Water Bottle Prefilter.
Answered by: REIservice
Date published: 2017-07-01
  • y_2017, m_7, d_19, h_7CST
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  • bvseo_sdk, java_sdk, bvseo-4.0.0
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  • QUESTIONS, PRODUCT