42 MM Filter Cap

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A lightweight and compact filter seamlessly connects with a 42mm water bottle.

Hydrapak says: 

Filter water on the go. The new 42MM Filter Cap threads seamlessly onto all sizes of HydraPak’s 42MM threaded Seeker water storage bags and Flux flexible bottles morphing them into filtration solutions. The end result being lightweight filtration kits that can either be used to squeeze filtered potable water into other camp bottles and containers or to drink freshly filtered water from a Seeker or Flux. Both deliver fast and easy water treatment around camp or on the go.

Our Verdict

On a recent trip, I took two filters, a heavy-duty one for processing water for food, as well as this 42mm Hydra Pak filter which I had connected to my water bottle. This setup meant I could quickly fill my water bottle from a stream or brook without having to take off my pack and get out of “hiking mode”.  

This meant I always had drinking water and was a much quicker system than stopping to process water whenever I needed a drink, not really in the “ultralight hiking mentality” but it worked for me. For a sacrifice of only 42 grams, it was something I’ll do again.

it’s easy to back flush, and you get a good flow rate, especially when sucking strait from the water bottle.

– Reviewed by Ultralight Outdoor Gear

Features

• LIGHT & COMPACT: At only 57 grams, our filter is one of the lightest filter options available. Its small size takes up no extra space when stored or threaded directly onto a Seeker or Flux.
• DUST COVER & HIGH-FLOW NOZZLE: Keeps dust off your drink nozzle. Quickly opens and closes the drink nozzle with one hand without any direct contact with dirty hands.
• 42MM THREAD COMPATIBLE: Easily thread the filter onto some of the most popular backpacking water storage bags and flexible bottles including the HydraPak Seeker 2L, 3L, 4L, and 6L and 1L and the Flux 750ML, 1L, and 1.5L
• FAST & SAFE FILTRATION: Removes 99.99% of E Coli & Parasitic cysts. Filters approximately 1,500 liters of fresh water at a rate of >1 L per minute.
• RELIABLE: Filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia (99.9%) from approximately 1,500 liters of water.
• SAFE: 100% BPA and PVC Free

Specifications

• Weight:42g
• Diameter: 42mm 
• Effectively removes common waterborne bacteria, such as E. coli (99.9999%), and parasitic cysts (99.999%) per EPA Guide Standards and NSF P231 and microplastics (99.999%) per NSF 42 greater than or equal to 3.0 microns in size. 
• Single stage < .2 micron hollow fiber filter 
• Effective against: protozoa, cysts, and bacteria 
• Meets or exceeds EPA protocol 
• Filters at >1L/minute 
• Filter life approx. 1500L

Material & Construction

• PP/POM, EPDM, Silicone, Hollow Fiber

Help & advice:

• Water Treatment Explained
• What does BPA Free Mean?