SteriPEN Adventurer Opti


5.00 out of 5

Lightweight water purification for peak performance in the outdoors! SteriPEN Adventurer Opti was built for the toughest mountains and rivers in the world. Backpacker Magazine gave it their Editor’s Choice Award in 2011 for changing the face of portable water purification.



SteriPEN Adventurer Opti UV Water Purifier

Recipient of a 2012 Desnivel Award … one of the 15 best new products. When camping, backpacking & hiking, if you won’t have access to the power grid for several days a time, this is the water purification system for you.

The Adventurer Opti UV water purifier is essential gear for thousands of adventurers and features a patent-pending technology – an optical eye senses water to ensure safe use and effective treatments. The revolutionary optical water sensor doubles as an integrated LED flashlight for added convenience on the trail or around the campsite: hold down the activation button for three seconds to illuminate the darkness.

Rugged design and construction trusted by thousands of endurance athletes. Adventurer Opti is powered by two CR123 batteries making it a lightweight water purification system and keeping it operating effectively in even cold environments. The long-lasting UV lamp provides purifies up to 8,000 liters! Works in containers with a minimum 1.75 inch diameter opening. (Like Nalgene wide-mouth bottles one liter bottles.)

Product Awards
Desnivel Award Backpacker Magazine Editors' Choice Award TrailRunner Magazine Editors' Choice

This product includes the SteriPEN Premium Lamp Life Pledge. After purchase from an authorized reseller, register your SteriPEN at Reach the lamp life limit (8,000 treatments) and we’ll replace it with a new SteriPEN! For details visit

Contents: SteriPEN Adventurer Opti Water Purifier, two disposable (non-rechargeable) CR123 batteries, neoprene case with belt loop, and user’s guide. Three year limited warranty.

Additional Information
Weight 3.8 oz
Dimensions 6.1 x 1.5 x 1 in
Lamp Life 8,000 treatments
Battery CR123 (included with purchase) or RCR123
Battery Life Disposable — 100, 0.5 liter treatments   Rechargeable — 80, 0.5 liter treatments
Minimium Bottle Diameter 35mm (1.4 inches)
Filter Compatability none
User Guide en | fr | es | de
FAQs SteriPEN FAQs | Adventurer Opti FAQs

Reviews (2)


  1. :

    I’ve had my SteriPEN Adventurer for several years and done several months of pike packing in the Colorado Rockies and this is the best form of purification I’ve ever used (I grew up in the Colorado mountains and used iodine then pumps in various forms). This is simply lighter and far simpler. I’ve used it in cattle country, after filtering through a bandana, without issue. My one suggestion is to make the shorter time be one click rather than two (which should be the longer time).

    • SteriPEN Marketing Team


      Hi Hilander! Great to hear from you! Just wanted to explain the click order is a safety feature … if a user mistakenly clicks only once, we prefer them to over treat rather than under treat, thus one click indicates one liter in some SteriPEN models. SteriPEN models with LED displays don’t require this safety feature as the user can verify the selected treatment size. Thanks again and please feel free to share your adventures with us at

  2. :

    I like the Steripen very much. It’s small and easy to use. The downside though is the type of batteries needed. Not to most common you’ll find in the world. I wish I knew about the USB version before I bought it. I am trying to lower my footprint, which was one of the main reasons I bought it. While it helps me to seriously reduce my plastic waist, I am polluting the world with batteries.

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