My buddy, his GF & I did a 4-day backpack trip in Necklace Valley (WA) two weeks ago where we used his new Hyperflow and found it very, very difficult to pump.

We all joked about MSR's hyper hype they projected onto the public about how it's Thee fastest water filter pump made, blah, blah, etc. They nailed the Hype all right.

HIGH FLOW: Pumps more than 3 liters per minute or one liter every 20 strokes.

http://www.msrgear.com/watertreatment/hyperflow.asp

Maybe in a controlled lab with the filter held in a vice, and a triathlete pumping purified bottled water. We barely achieved 1-liter per minute with his new Hyperflow.

As the late Ron Gregg said, "this industry is full of hype." LMAO
O.R. gear designer guru.

It's a compact, and yes light weight pump H2o filter but it doesn't pump as fast as it says it does in my experience. I would expect such hard pumping to occur after a few dozen gallons pumped not a few liters later.