I picked up a terraframe 50 in June and used it on a backpacking trip in Oregon. Covered roughly 100 miles on various trails and terrain. I carried about 40ish pounds in it between gear and food. I put all of my personal gear inside, in a Sea to Summit dry bag (40L) and the zippers were pretty handy to load and unload. I put my food in another dry bag and sandwiched it between the frame and the pack.
The ability to get the pack away from the frame on the terra is WAY easier than on any of the hunting packs that MR makes. Its a simple buckle and its done, no adjusting all of the straps and pulling it over the frame.
The side pockets lay flat when not in use and I managed to stuff two 32oz Nalgene bottles in, but it was tight. The strap can also go through the pocket to help tighten the pack up. The belt is no frills, just the ability to adjust and that's it. No pockets or webbing.
I have a Marshall, Crewcab and a custom bag, and this little pack was a good addition to the line up for my non hunting uses.