I remember when I first joined this forum and was looking to get a quality pack. I was immediately turned off by how many people were "shoveling" Kifaru down my throat. I made it a point to exclude them from my pack options. I ended up with an Exo, and I really liked the pack but after a couple of years with it I began to notice some of the shortcomings for me. I started paying closer attention to the Kifaru recommendations and found that a Kifaru frame solved the minor shortcomings I was having with the Exo frame/belt. I, like others, ended up with Exo bags on a Kifaru Hunter frame and it suits my needs much better. My point in telling this story is that the OP seems set on only looking at Mystery Ranch and Exo, both very good offerings no doubt, but I don't think they should be the only two options you consider. I'm very happy with my current setup, but I'd still like to try a Stone Glacier and a Seek Outside with some weight for comparison. It also looks like Exo has made and is continuing to make solid improvements and I wouldn't mind giving their frame another try to see how far they've come. In the end, I'm very happy to have so many good pack options and the Rokslide classifieds make it much easier to "test" packs out and compare and then move on to the next option.