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With a capacity of around 8,000 uses, the Steripen Adventurer Opti™ UV Water Purifier is the ideal water purification system for longer camping, backpacking and tramping trips where you will not have access to the power grid for several days at a time. It can be used to treat 0.5L or 1.0L of water and is compact and light (103g) to easily stow in your travel bag or backpack.

An optical eye senses water to ensure safe use and effective treatments. It doubles as an integrated LED flashlight for added convenience on the trail or around the campsite – simply hold down the activation button for three seconds to turn on.

The rugged design and construction makes it trusted by thousands of endurance athletes. It is powered by two CR123 batteries, operating effectively even in cold environments.

Works in containers with a minimum 4.5cm diameter opening. (Like Nalgene wide-mouth 1L bottles).


  • Ultraviolet (UV-C) light rays safely purify clear water by destroying 99.9% of protozoa (including Giardia and Cryptosporidium), bacteria and even viruses.
  • The revolutionary optical water sensor doubles as an integrated LED flashlight. Hold down the activation button for three seconds to illuminate the darkness.
  • When the treatment is complete, LED indicators flash to let you know that the water is safe to drink.
  • Treatment size: 0.5L or 1L
  • Treatment time: 48 or 90 seconds
  • Use only on clear water, as cloudy, sediment-laden water hinders effectiveness.


Water: Tap water, clear water
Usage: Often
Product type: UV pen
Effective against: Bacteria, protozoa, cysts, virus
Output: 0.5 L = 48 sec / 1 L = 90 sec
Weight: 103g
Dimensions: 15.5cm x 3.3cm x 2.2cm
Batteries required: Yes
Batteries included: Yes
Battery type: 2 CR123
Approx. Treatments (per battery charge): 50
Product life: 8,000 activations

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