Any of the big three (Kifaru, SG, and Exo) should be able to easily haul 60+ pounds without any trouble. Try them and see which fits you best. I've tried all three, but I use a SG.
This is about as good of advice as he can ask for. Everyone seems to have a preference, if one was the “best” everyone would use it
For me, the K4 is in a league of its own when considering the whole package. It hauls weight as well as my kifaru, and is just as stable with a heavy awkward load, and is extremely comfortable in hunting mode.
It’s the only pack I’ve used that doesn’t trap blackberry and salmonberry debris between my back and the lumbar pad (which used to give me a painful rash that would never heal) some packs were better than others, but the k4 doesn’t do it at all… not sure why, but I like that
It’s not a hot pack on your back in warm weather, breathes well, good head clearance, and being an inch taller than my kifaru was, is no more snaggy in the brush, which I think is the frame angle above my shoulders… it follows my body ducking under and going through brush.
The k4 is like a mix of all of the good pack attributes I’ve had over the years. Like the bags, everything on it is extremely intuitive, breaking the pack down to haul meat isn’t a puzzle, it’s built so even simpletons like me have no problem with it.
Lid cinches down and isn’t floppy… I could go on, I love that pack system… the next guy may feel the same way about a different pack. Trying some with weight is ideal but not practical.
Exo gives a trial run of 30 days I believe, and I think I’ve heard similar of other pack companies. I do think it’s one of the items you shouldn’t compromise on if you can swing it, or you will end up paying double through the upgrade process (like glass)