2 Free Issues and 3 Free Gifts!
Full Name:
Address 1:
Address 2:
Zip Code:
Email: (required)
If I like it and decide to continue, I'll pay just $12.00, and receive a full one-year subscription (9 issues in all), a 73% savings off the newsstand price! If for any reason I decide not to continue, I'll write "cancel" on the invoice and owe nothing.
Your subscription includes 3 FREE downloadable booklets.
Or click here to pay now and get 2 extra issues
Offer valid in US only.

Also on

Enter Zip Code

Backpacker Magazine – March 2011

Gear Review: MSR HyperFlow Filter

A lightweight filter that filters at a rate of three liters per minute.

by: Dan A. Nelson

MSR Hyperflow (Courtesy Photo)
MSR Hyperflow (Courtesy Photo)

See 7 More Ways to Treat Water
From gravity filters to chemical treatments
[fastest filter]
This tiny water-treatment plant weighs less than half a pound, yet filters water at a category-leading rate of up to three liters per minute. That’s why the HyperFlow earned an Editors’ Choice Award in 2008, and why it’s still our testers’ favorite for turbid water sources. After hiking the Northern Loop Trail in Mt. Rainier National Park, a tester reported that the .2-micron, hollow-fiber filter (a cluster of tiny porous tubes) is still chugging away after treating nearly 775 liters of water (with backflushing as needed).

Filter cartridges are field-cleanable and good for about 1,000 liters (according to MSR). Caveat: Keep it warm. On icy mornings testers reported difficulty pumping. Eliminates: protozoa (including cryptosporidium) and bacteria. $100; 7.4 oz.;

Subscribe to Backpacker magazine
Sign up for our free weekly e-newsletter
Address 1:
Address 2:
Email (req):
Reader Rating: -


Mar 15, 2011

Bought this filter for a group of 3 hiking the John Muir Trail. It clogged, back flushing didn't solve the problem and it was totally useless by day five. Another member of the group carried a Katadyn Guide, it performed perfectly and pumped fast for the remainder of the trip. I returned the MSR to REI for a full refund and was told it is great if you only filtering snow melt in high elevation lakes.

Mar 15, 2011

THis filter clogged after several liters and was impossible to restore to original conditions. Read the REI website for more testimonials on this filter. My recommendation is to leave it on the shelf.

Mar 15, 2011

Our filter needed backflushing every 3 liters , filtering clear high sierra water on the John Muir Trail.It was a major pain.

Mar 15, 2011

I have this filter and have owned it for a couple of years. It is light and easy to use, but even with proper back-washing expect to replace the cartridge at least once during a hiking season if you live in the northeast. I section hiked the AT 25 days last year and 14 days the year before. I have replaced the element twice in the last two years. This is not a good filter for groups but OK for one or two people. Keep a chemical back-up just in case it fails.

Mar 15, 2011

As far as I am concerned there is only one water filter: the Katadyn Pocket. Yes, it's more expensive and heavier than most but it's built like a tank. If you need reliability on your expedition-style outing this is the one to get. Simple to use and clean, in my mind the last filter you'll ever buy. I had two filters break in very light and gentle use. On both, plastic parts snapped off or broke. I won't have to go through having to boil water for a team of six again.

Mar 15, 2011

If it was an icy morning, I hope there wasn't ice allowed to form in the filter; hollow fiber filters like this and Sawyer's will break if ice crystals form in them, and the worst part is there is no way to tell if you're filter is kaput or not until you get the poops.


Your rating:
Your Name:


My Profile Join Now

Most recent threads

Ruined jacket in dryer
Posted On: Sep 01, 2014
Submitted By: SWest
Trailhead Register
Stick is fine
Posted On: Sep 01, 2014
Submitted By: eyebp

View all Gear
Find a retailer

Special sections - Expert handbooks for key trails, techniques and gear

Check out Montana in Warren Miller's Ticket to Ride
Warren Miller athletes charge hard and reflect on Big Sky country, their love for this space and the immense energy allotted to the people who reside in Montana.

Boost Your Apps
Add powerful tools and exclusive maps to your BACKPACKER apps through our partnership with Trimble Outdoors.

Carry the Best Maps
With BACKPACKER PRO Maps, get life-list destinations and local trips on adventure-ready waterproof myTopo paper.

FREE Rocky Mountain Trip Planner
Sign up for a free Rocky Mountain National Park trip planning kit from our sister site

Follow BackpackerMag on Twitter Follow Backpacker on Facebook
Get 2 FREE Trial Issues and 3 FREE GIFTS
Survival Skills 101 • Eat Better
The Best Trails in America
YES! Please send me my FREE trial issues of Backpacker
and my 3 FREE downloadable booklets.
Full Name:
Address 1:
Zip Code:
Address 2:
Email (required):
Free trial offer valid for US subscribers only. Canadian subscriptions | International subscriptions