Hey There,
I know this is an old thread but I thought I would update it a bit. I just received a Kifaru 22" frame and Muskeg 2800" bag. I'm still working through fitting, but my initial impression is that it is pretty comfortable. The bag seems maybe a bit small so i may be adding a Kifaru lid of some sort. Talking with Kifaru customer service was great. They did tell me that a 22" frame would limit the size of the bag I could use. I chose the Muskeg as it is made with waterproof material (Bag is not rated as waterproof as seams aren't sealed, I might do this later). I decided to risk the smaller frame options as I am a smaller guy and have often had to use gear that just didn't fit (Army Alice pack in the 90's was the last time I used an external frame pack for any length of time), so I wanted to go with optimal fit and try to adjust other gear to fit. Some of the people on the Kifaru insiders page on FB did say bigger bags could be used but it would take some fiddling and the bag might hang low. My goal is to do a minimum of 5 overnight or 3 day trips this year in addition to a 5 day guided hunt I have scheduled. I know that's not a lot but it beats the zero I did last year. I'll try and update my experiences with this setup. I'm trying to avoid my natural tendency to just buy *censored* that sounds cool and give this an honest thorough chance.
Cameron