Good luck on the solo single pack out too.
I have a MR crewcab that is great for light packing,scouting ,glassing & deer hunts but no way I would haul an elk in it.Maybe I'm still getting used to it and adjusting with weight in off season will help.
But I am going back to my Eberlestock J104 for hunting.The scabbard is worth it's weight in gold,IMHO.I use it for everything like Paul.Tripods,fishing rods and mostly a rifle on the way out so my hands are free for the poles or grabbing rocks.
I use a safari sling so my rifle is always right there when hunting. If I'm climbing I have to put it over my back.
Tried & used the hold on the side deals with other packs but a barrel sticking up does not work where I hunt.Maybe for a short stretch.And I do seem to just run into critters on the hunt and by the time I got the damn rifle free or off my shoulder even with a fancy quick dismount,too late.
The E-stock can carry more than I want & my camp. It fits me,is comfortable under load,quiet and has the scabbard. It weighs a bit more than the newer packs or the MR. But a load of meat & gear solo is doable,and not in one trip anymore.lol