I agree with everything here. I too had 120 lbs of gear and bear on my back and thought it was only 100 lbs. The Xcurve Carrieās well. Iāve owned mine since 2017.I love my sky 5900, but mostly because the x-curve frame fits my back so well. It's a little tall and touches the back of my head when loaded, which can be annoying. If you have a curvy back I'd recommend sky 5900 with x-curve. I try not to carry 100+ lbs, but I weighed my bag with quartered out whitetail and it was 121 lbs to my surprise. Carried it well.