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Diarrhea will help you drop weight, but you have to carry more toilet paper. Or more hand soap.

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.

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Hydro Photon SteriPEN Adventurer Opti

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5 5

Scotty V.

Member since 
  • Familiarity: I've used it several times

Makes purifying water that much easier. Lightweight, can double as an emergency backup light (total last minute option), and has not let me down yet, and I've used it in many different places. Only reason I'm giving it four stars is because you have to hold it submerged and stir, and if it barely comes out of the water, you gotta restart. Depending on what the water is in might make it difficult. This was taken in GSMNP:

Steripen Rocks!
5 5

Carson Dunbar

Member since 
  • Gender: Male
  • Familiarity: I've used it several times

No issues. AWESOME product. THis thing is durable, the battery lasts longer than anticipated and I feel confident in the safety of the water after it's use. I ALWAYS pump my water through an MSR ceramic filter first for precautionary measures.

5 5

almortal

Member since 
  • Familiarity: I've put it through the wringer

I am very weary of backpacking with anything battery dependent, but this thing has converted me. It is nearly weightless yet the casing is really sturdy. It is so easy to use. Super easy. There is a single button, and the light on it lets you know when its done, if it was successful (occasionally it will flash red if you pull it out too early), if the battery is running low, and many other things. And it doubles as a flashlight for rifling through your bag. The only downside is that you have to use a widemouth 1 litre bottle.
The real reason I dropped the money on it is because it doesn't alter the taste and treats everything. I love that I can now drink the amazingly delicious mountain water and know it is safe. Nonetheless, on long backcountry trips I still keep a few iodine tablets in my first aid kit, just in case.

5 5

J.D

Member since 
  • Gender: Male
  • Familiarity: I've put it through the wringer

The Steripen is an awesome invention. It is super light compared to pumps and it is just as effective at removing microbes from your water. The batter life lasts a while and it can purify many gallons of water. I highly recommend getting one. Just make sure the silver sensors are submerged when using it: That is what triggers the light.

4 5

Yung Lee

Member since 

let's talk about the pros:
1. the unit is small and light (weighs a total of less than 6 oz with batteries and the separately sold FitsAll Filter)
2. the uv light looks pretty cool when you're using it
3. no need to pump
4. won't leave weird taste

how about the cons
1. it takes over 90 seconds to treat 32 oz of water. If you account for the "pre" filtering using the FitsAll filter, we're talk about ~3 minutes for less than a liter of water.
2. it will have a hard time (or not work) treating murky water. On mostly clear water though, I still use the FitsAll filter.
3. it uses batteries.

With the limitation of no easy way to treat murky water and the time it takes to filter compared to some pump/squeeze type filters, this is my unit of choice only if I know the water source available will provide "clear" water. But weighing less than 6 oz with the FitsAll filter, I haven't found a reason not to carry this as a backup.

solid go-to, or an awesome backup unit
5 5

BzBrian

Member since 
  • Gender: Male
  • Familiarity: I've used it several times

Simple & super easy to use. You won't feel lazy to purify your like how you would with a tough pump. For it's purpose, it works wonders.

4 5

cunp86656

Member since 
  • Gender: Male
  • Familiarity: I've put it through the wringer

Over the past 20-months, I've used the SteriPEN in the Peruvian and Ecuadorian Andes with clear water but suspect surroundings. I always carry tablets as a backup due to the reliance on batteries but like the convenience of being able to drink immediately after treatment. In areas with lots of water, that means I carry less water since I don't have to carry an extra liter waiting for chemical treatment to kill everything. You should still rinse bottle threads after treatment, just like with chemicals, and you'll need a wide enough opening to insert the pen. When carrying a water bladder, I leave a pot near the top of my pack. For refills, I fill the pot with a liter of water, treat it with the pen, and then pour that liter into the bladder. For hiking (no pot), I carry a Nalgene bottle. I balance this inconvenience against the wait time with chemicals vs. the weight of a filter.
The visible light (indicating that the UV lamp is on) is difficult to see during the day. If they'd put an indicator light on top of the pen, it would be easier to operate.
I also use the pen while traveling to treat municipal water and reduce the number of bottled waters I would otherwise buy. In short, it is a convenient and reliable foreign travel companion.

5 5

Jason

Member since 

I used a MSR Hyperflow for a couple trips, but decided to try new technology after the Hyperflow became difficult to pump midway into a hike. I generally backpack in areas that have clear but microbially suspicious water, so UV seemed like a perfect solution. The Steripen Adventurer worked well on a recent trip in Utah canyon-country, keeping us healthy even after having to drink from stagnant pools that were very questionable looking. Keep in mind that this will not alter the taste of the water (for better or worse) like filters or chemicals will. UV also works best in clear(ish) water, so in areas with a lot of suspended sediment this might need to be coupled with a mechanical filter of some type. Overall an extremely effective and quick way to treat water.

4 5

DeanSLC

Member since 

Works amazingly for travel abroad in countries where you can't trust the water. Bring spare batteries, though. I had to change batteries twice over two months of daily use.

4 5

DeanSLC

Member since 

Works amazingly for travel abroad in countries where you can't trust the water. Bring spare batteries, though. I had to change batteries twice over two months of daily use.

4 5

Joh4862411

Member since 

I used the Adventuerer on a 5 day hike on the AT trail in May of 2012. Most of the water sources were clear with little suspended solids so we were able to skip the pump filter. We used the SteriPen almost exclusively treating probably 2 gallons per day. We had no adverse affects during or after the trip. The SteriPen saved time and saved the expensive pump filter cartridges for when they are really needed. Battery life was not an issue during the 5 days

5 5

cfr2829139

Member since 

Used this pen to purify several gallons of water on Kalalau trail. Performed great, quick and effective.

5 5

Mike

Member since 

The SteriPen is lightweight, easy to use, and worth the money. Although I do not recommend the SteriPen Pre Filter as a companion, since it only removes larger particulate matter. After melting down 3.5 liters worth of snow, filtering it twice, then sterilizing we were still left with slightly turbid and gritty water. (Please note I do realize the SteriPen does nothing for removing particulates.)

5 5

SW

Member since 

Love this thing. It fits perfectly into a jersey pocket. Easy to use. Faster than iodine or a pump. I copied another reviewer's technique of cutting the top off of a platypus mini-dromedary to fit the steripen far enough into the water when treating a full liter. I've used it on multiple long training mt bike rides and runs.

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