HIGH FLOW RATE: Access potable water anywhere. Filters approximately 1,500 liters of fresh water at a rate of >1 L per minute.
SAFE: Effectively removes common waterborne bacteria (99.9999%), and parasitic cysts (99.999%) per EPA Guide Standards and microplastics (99.999%) per NSF 42 greater than or equal to 3.0 microns in size.
EASY TO USE: The high flow drink nozzle is easy to open and lock with one hand, and is equipped with a dust cover that keeps your valve clean and protected from the elements.
COMPATIBLE: Perfect for trailrunning, cycling or backcountry water filtration. Works with all 42mm opening HydraPak products including running flasks, Seekers and Flux bottles.
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 our Seeker or Flux.
Specification: HydraPak 42mm Filter Cap – Water Filtration Accessory – Fast Flow – Perfect for Hiking, Endurance Sports, Camping, Travel, and Emergency Preparedness
Material
‎PP/POM, EPDM, Silicone, Hollow Fiber
Product Dimensions
‎1.65"D x 1.65"W x 5.1"H
External Testing Certification
‎NSF
Product Benefits
‎Provides high flow rate, safe filtration removing bacteria, parasitic cysts, and microplastics, with easy usage and wide compatibility
Brand
‎HydraPak
UPC
‎834456003236
Unit Count
‎1.0 Count
Number of Items
‎1
Manufacturer
‎Hydrapak
Part Number
‎HYF03N
Item Weight
‎0.141 ounces
Item model number
‎F03
Size
‎42mm
Color
‎Blue
Style
‎Potable Water Filter
Installation Method
‎Direct Attachment
Item Package Quantity
‎1
Flow Rate
‎1 Liters Per Minute
Special Features
‎NSF certified
Included Components
‎42mm Filter Cap
Batteries Included
‎No
Batteries Required
‎No
Warranty Description
‎Beyond Lifetime Warranty
Date First Available
January 27, 2023
10 reviews for HydraPak 42mm Filter Cap – Water Filtration Accessory – Fast Flow – Perfect for Hiking, Endurance Sports, Camping, Travel, and Emergency Preparedness
4.6out of 5
★★★★★
★★★★★
9
★★★★★
1
★★★★★
0
★★★★★
0
★★★★★
0
Write a review
Show allMost HelpfulHighest RatingLowest Rating
★★★★★
Amazon Customer –
S’adapte parfaitement à ma flasque Salomon 42mm nickel
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★★★★★
D. Bauer –
Great filter. Used for 20+ days in the backcountry this year. Filtering mostly clean creek water most of the time. Flow rate is excellent. Would recommend.
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★★★★★
John Paulson –
These work great combined with the 2 liter bottle they sell. We used these on a recent trip to South America where water from the tap was not drinkable. We poured tap water to the 2 liter bottle then filtered it into other reusable bottles we brought with us. We also have a Travel Berkey we bring if the water is really sketchy (with pre-treatment using plain bleach as needed to kill virus and amoebas).
The flow rate on this filter is great and you can’t get a lighter system to travel with.
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★★★★★
/bob –
Have used these the last few years in the Colorado high country for filtering water. The hydrapak bags seem to be better than Sawyer bags. Fast flow. Have not had issues with clogging as long as you use decent water to start and are careful up front to avoid sediment.
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★★★★★
/bob –
Hopefully HydraPak is reading this. Love the idea and this filter flows water well. I’ve used it on 3 camping trips so far, 3-4 days each, and on the last trip I noticed the cap is cracking. The end that locks the cap closed is cracked and a small bit of material is missing that wasn’t when new. The center top of the cap has several cracks in it. The filter is good but would be much much better if it lasted longer. That is the only reason for a lower rating here. A cracked cap renders the filter contaminated and worthless for its intended purpose and, thus, unusable.
Update: I submitted a claim for service to HydraPak and they came through with a warranty replacement of the filter. Received the new replacement filter cartridge earlier this week. I will see how it performs during the next 2 camping trips in September but I do really like this system so far.
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★★★★★
Flogramz –
I’ve used the HydraPak 42mm Filter Cap on multiple trail runs and backpacking trips, and it’s quickly become one of my favorite pieces of gear. The fast flow rate makes it super convenient…you don’t have to wait long to fill up or squeeze hard to get clean water. On long runs, I’ve been able to scoop water from streams and keep moving without slowing down too much.
The design is simple and lightweight, and it pairs perfectly with my HydraPak soft flasks and reservoirs. I really appreciate how compact it is, easy to stash in a pocket or side pouch without adding bulk. Even after repeated use, it still works smoothly and hasn’t clogged up.
Overall, this filter is reliable, quick, and perfect for anyone who wants a hassle-free hydration solution on the move. It’s a must-have for trail runners, hikers, and backpackers looking for a lightweight water filter that just works.
Helpful(0)Unhelpful(0)You have already voted this
★★★★★
Gentle Reader –
I use this with the 4L seeker for backpacking and I love it. Just fill it up when ever I am near water and fill up my nalgene or boil pot when ever I need water. This replaces my 3L water sleeve and removes the need to pump/filter water to refill my reservoirs. Not I just filter water when I need it. It filters pretty fast, but I have not tested yet with murkier water sources yet. Had good water sources this year in the back country.
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★★★★★
Thomas –
Easily my favorite backpacking water filtration system I’ve used to date. Flow is superior to sawyer and platypus. In fact it’s so fast that I have doubts it’s actually filtering anything, although Ive never been sick afterwards. Will be purchasing more.
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★★★★★
eric –
Lifesaver for filtering water on long runs. Be sure to flush it first or it will have a bad taste
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★★★★★
SSG Shawn –
Perfect replacement fit – best filter system on the market for size, quality, and pack weight. I did not follow proper long term storage procedures and required a replacement cartridge for my AT section hike. In hindsight, I should replace the filter annually.
Ajay Bharadwaj
Amazon Customer –
S’adapte parfaitement à ma flasque Salomon 42mm nickel
D. Bauer –
Great filter. Used for 20+ days in the backcountry this year. Filtering mostly clean creek water most of the time. Flow rate is excellent. Would recommend.
John Paulson –
These work great combined with the 2 liter bottle they sell. We used these on a recent trip to South America where water from the tap was not drinkable. We poured tap water to the 2 liter bottle then filtered it into other reusable bottles we brought with us. We also have a Travel Berkey we bring if the water is really sketchy (with pre-treatment using plain bleach as needed to kill virus and amoebas).
The flow rate on this filter is great and you can’t get a lighter system to travel with.
/bob –
Have used these the last few years in the Colorado high country for filtering water. The hydrapak bags seem to be better than Sawyer bags. Fast flow. Have not had issues with clogging as long as you use decent water to start and are careful up front to avoid sediment.
/bob –
Hopefully HydraPak is reading this. Love the idea and this filter flows water well. I’ve used it on 3 camping trips so far, 3-4 days each, and on the last trip I noticed the cap is cracking. The end that locks the cap closed is cracked and a small bit of material is missing that wasn’t when new. The center top of the cap has several cracks in it. The filter is good but would be much much better if it lasted longer. That is the only reason for a lower rating here. A cracked cap renders the filter contaminated and worthless for its intended purpose and, thus, unusable.
Update: I submitted a claim for service to HydraPak and they came through with a warranty replacement of the filter. Received the new replacement filter cartridge earlier this week. I will see how it performs during the next 2 camping trips in September but I do really like this system so far.
Flogramz –
I’ve used the HydraPak 42mm Filter Cap on multiple trail runs and backpacking trips, and it’s quickly become one of my favorite pieces of gear. The fast flow rate makes it super convenient…you don’t have to wait long to fill up or squeeze hard to get clean water. On long runs, I’ve been able to scoop water from streams and keep moving without slowing down too much.
The design is simple and lightweight, and it pairs perfectly with my HydraPak soft flasks and reservoirs. I really appreciate how compact it is, easy to stash in a pocket or side pouch without adding bulk. Even after repeated use, it still works smoothly and hasn’t clogged up.
Overall, this filter is reliable, quick, and perfect for anyone who wants a hassle-free hydration solution on the move. It’s a must-have for trail runners, hikers, and backpackers looking for a lightweight water filter that just works.
Gentle Reader –
I use this with the 4L seeker for backpacking and I love it. Just fill it up when ever I am near water and fill up my nalgene or boil pot when ever I need water. This replaces my 3L water sleeve and removes the need to pump/filter water to refill my reservoirs. Not I just filter water when I need it.
It filters pretty fast, but I have not tested yet with murkier water sources yet. Had good water sources this year in the back country.
Thomas –
Easily my favorite backpacking water filtration system I’ve used to date. Flow is superior to sawyer and platypus. In fact it’s so fast that I have doubts it’s actually filtering anything, although Ive never been sick afterwards. Will be purchasing more.
eric –
Lifesaver for filtering water on long runs. Be sure to flush it first or it will have a bad taste
SSG Shawn –
Perfect replacement fit – best filter system on the market for size, quality, and pack weight. I did not follow proper long term storage procedures and required a replacement cartridge for my AT section hike. In hindsight, I should replace the filter annually.