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Katadyn SteriPEN Ultra — Specs & Analysis
Manufacturer specifications, compared against every other hydration in our database. We do not test gear in the field — we measure, verify, and compare.
The Katadyn SteriPEN Ultra uses UV-C light to destroy 99.9% of bacteria, viruses, and protozoa in 90 seconds. Its rechargeable battery and compact design make it a versatile purification tool for international bikepacking.
The Katadyn SteriPEN Ultra occupies a unique niche in the bikepacker's water treatment arsenal: it is one of the few ultralight options that effectively neutralizes viruses in addition to bacteria and protozoa. For bikepackers traveling in regions where viral waterborne illness is a concern, this capability is not optional — it is essential.
Operation is dead simple. Submerge the UV bulb in up to one liter of water, press the button, and stir gently for 90 seconds. The UV-C light scrambles the DNA of pathogens, rendering them unable to reproduce and harmless to drink. An indicator light confirms when the treatment cycle is complete.
The internal rechargeable lithium-ion battery provides approximately 50 treatments per charge, which translates to 50 liters of clean water. Charging via micro-USB takes about three hours, and a full charge will last most bikepackers several days between access to power. The battery level indicator lets you plan recharges proactively.
At 76 grams, the SteriPEN Ultra is lighter than most pump filters and far less bulky. It slides into a jersey pocket, top tube bag, or handlebar roll alongside a few snacks. The included neoprene case protects the UV bulb during transport.
The critical limitation is that UV purification only works in relatively clear water. Turbid or silty water blocks the UV light from reaching all pathogens, significantly reducing effectiveness. In those conditions, you need to pre-filter through a bandana or dedicated pre-filter before using the SteriPEN.
For bikepackers who need virus protection and value speed and simplicity, the SteriPEN Ultra is a proven solution that complements filter-based systems or replaces them entirely in clear water sources.
Who Is the Katadyn SteriPEN Ultra Best For?
International bikepackers who need virus protection from water sources in developing regions. If that describes your riding style, the SteriPEN Ultra should be at the top of your shortlist. It sits in the Hydration category alongside 15 other products we track.
How It Compares
At 76g and $90, the SteriPEN Ultra is 39g heavier than the lightest option in this category (the Vapur Eclipse 1L at 37g). The most budget-friendly option is the Vapur Eclipse 1L at $13.
The price-to-weight ratio comes in at $118 per 100g — a premium price point, but you're paying for quality, materials, and design that justify the investment for serious bikepackers.
What We Like
- +Destroys viruses, bacteria, and protozoa
- +Rechargeable battery lasts 50 treatments
- +Incredibly lightweight at 76 grams
- +90-second treatment cycle is fast
Watch Out For
- −Ineffective in turbid or silty water
- −Requires battery charge — no manual backup
- −Micro-USB port instead of USB-C
The Bottom Line
We haven't scored the Katadyn SteriPEN Ultra, and neither has anyone else we can cite. It's here for its verified specifications and dimensions, which is what the fit tools run on — a score is an editorial judgement, and we don't hand one out until someone has a basis for it. What this page can tell you is measured: 76g, $90, and how both sit against every other hydration product we track.
The price and weight above have not yet been checked against the manufacturer's own page. We are working through the catalogue and saying so as we go, rather than letting silence imply otherwise.
Specifications and dimensions come from the sources listed above. Where a page draws on first-hand riding, it says so.
What it packs down to
Katadyn publishes a packed size of 16.5 x 3.3 cm, which is 0.1 litres as a stuff sack. Of the 55 bags we track that publish a capacity, 55 have room for it and 0 do not.
Volume is computed from Katadyn's own packed size, treating a two-dimension figure as a stuff sack. Bag capacities are the makers' published figures, not ours — 12 of the bags we hold dimensions for publish no capacity and are left out of the count rather than assumed. A stuff sack does not reshape itself, so read the headroom as room to spare rather than a guarantee it goes in easily.
How it compares
Against the 16 hydration products we hold published specs for.
At 76g the SteriPEN Ultra is lighter than 11 of 15 alternatives we track. The category median is 116g.
At $90 it undercuts 1 of 15 of them, against a median of $45. That works out at $118 per 100g — above the $35 median for hydration products.
Weight and price come from published specifications. Cost per 100g is a blunt measure — it rewards light gear and says nothing about durability or whether the thing works — so treat it as one input, not a verdict.
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