I had a Eberlestock pack and sold it. They have a non functional load lifter system and are heavy packs. The pack had considerable sway when packing heavy loads because of the scabbard system between the main frame and the pack compartment. I went with a Kuiu Ultra 6000 and love it. It has a system for carrying a rifle on the side of the pack. With the weight savings on the Ultra, my pack, sleeping bag and tent weigh less than my old Eberlestock alone. The Kuiu Ultra series also get's a lot of criticism but I really like it.
I use the Kifaru EMR ll for anything over 4days works great, also the Crew Cab by Mystery Ranch for weekend hunts both packs can handle heavy loads with ease and comfort. My brother owns a Just One pack and I only heard him complain about the fit.. I believe that's where Kifaru excels. Give them a call they will explain their packs and how to fit one. Not to mention endless options for frames