I run a 5000 ci plus for most everything now, even on day trips. I have used Eberlestock, Kuiu, Badlands, Kifaru, Mystery ranch and am trying an exo now. I would stay away from Badlands unless you are packing under 40 pounds. Eberlestock is less expensive and I like it up to 50 pounds. Over 50 pounds I like the Kuiu, Kifaru, and Mystery ranch. I have heard the Exo is right there with the best and I am giving it a go this spring. My Mystery ranch is a little heavier than the other 3, I have an older version, not the Metcalf. I dont like the belt pockets on the Kuiu, hard for one hand operation. The top lid on Eberlestock and Mystery ranch can get a loosey goosey if you put to much in and not much in the main bag.
The Kuiu, Kifaru, and Exo don't seem to be as floppy and easier to manage. My Mystery Ranch does not have a strap that runs horizontally across the back to cinch things up. Some guys dont think Kuiu can handle the real heavy loads, mine has been just fine, but I also have never packed over 75 pounds in it.The compartments and accessiblity vary from different brands and models in those brands. I like 2 deep outside vertical pockets for spotting scope and tripod. Find one that fits you. Some are more adjustable to different body types than others.