Originally posted by Biathlonman: I went to a backpack hunting class put on by a hard core backpack hunting guy with very experienced folks in attendance a few years back. We put about 100 lbs. In a number of different packs. The carbon fiber kuiu barely made it off the ground before the fiber started cracking and no one was willing to put it on for fear of total failure. Mystery Ranch (don't recall model) did ok and Kifaru was far and away the most comfortable as judged by the 4-5 folks willing to try the load. This was probably 5 years ago so many of the packs mentioned weren't available then but it was eye opening to me.