I wanted this pack to work so badly, but my bony hips made it impossible. I love my Kyte pack which I use when climbing and needed to replace my big pack. I'm 5'4" 130lbs and I have a long torso--was measured for a small. I carry a 30-40lb load. I had it fitted and went on a 10-mile backpack which destroyed my hips to the point where I had to adjust the fit so the belt wasn't rubbing on the way back. I had it fitted again before my last 25ish mile trip and wore moleskin on my hips. Again, the skin around the moleskin was left raw and scraped. I also had to tighten the straps to the point of leaving bruises on my collarbones to not get the sense of being pulled back. In the end, I loved the pockets, the ease of packing, the zippers were very smooth, it tightened down easily, the capacity was great, it was highly adjustable, so many good things. But, I hated putting it on--the belt is annoying to get around because of the stiffness, it dug into my lower back (probably because I had to shift my load due to the feeling of being pulled back), and the hip scrapes sucked. It's a good pack, just didn't work out for me. So, back to the drawing board. I may try an Ariel or something else.
Orange County, CA