I’ve owned several of the Kifaru frames (Bikini and Duplex Lite) and bags(High Camp, Woodsman, Reckoning, and Hoodlum) and also am presently running an SO Saker. Despite wanting the Kifaru system to work, I was unable to get the waist belt to stay in place under load. Tried multiple means of adjustment, coupled with positioning of weight within the pack, and for my build the belt just kept slipping. That said, I would not hesitate to recommend or purchase Kifaru in the future.
Seek Outside’s frame design coupled with the floating belt works for me. All belts slip/sag under significant weight(100+ lbs IME), as should be expected. The SO belt does not slip until above 100 lbs. IME.
Bedrock and Paradox had several essays on this very subject several years ago, and it’s what caused me to try SO.
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