This bag works perfectly on my Exo Mountain Gear K4 5000. Form factor acts just like a boned out meat bag. I was able to fill it with a bag and a half of unwashed pea gravel. I just lined the bag with a couple of contractor bags to keep the Mule bag clean. I'm not sure exactly what the bag and fill weigh exactly, but on my K4 frame with a Crib Load Panel my ruck weighs 77 lbs.
My buddy saw it and immediately ordered one as well. The color that he ordered was actually out of stock and the guy at Onus gave him a call immediately and told him that the color had just run out but the website hadn't updated yet. He apologized, told him he would have to wait a whole week (lol) and offered to refund his shipping. My buddy said that it was ok and no worries. Onus quick shipped one anyway and he ended up receiving it in about the same time. That's service!
