I've never used Kifaru, but I just bought a Mystery Ranch Crew Cab this year. I have used it to haul one bull elk and a mature buck this last weekend. The bull I was with a buddy and we did it in 2 trips. The pack worked perfectly and was very comfortable. I think total weight of that pack job was about 100 for the heavier load. No big deal really. The deer I shot last weekend was another story. When I got home and weighed my pack it weighed 142 pounds. That's the heaviest load I've ever carried and it sure felt like it! It really sucked! The only reason it sucked is because I only weigh 180 pounds......my pack was less than 40 pounds less than my weight. The pack performed great though and held all my day gear, tripod, spotting scope, gun, whole deer and caped head, extra clothes, etc. The pack never seemed to want to bust a seem or zipper or anything. Like I said it did great. For as heavy as it was I would say it was kind of comfortable too......not sure how comfortable you can be though with real heavy packs. Not sure if this helps, just my experience with MR.