I have three but used to have more. I have gotten rid of anything over 4,000 CU INS because I simply don't want to carry that much shit anymore. To hard on the back, the knees and the ankles.
1. Mystery Ranch Scree 32 - Just a tiny bit under 2,000 CU INS and no meat shelf, I use this for EDC, scouting, hiking, fly fishing and travel.
2. Mystery Ranch Terraframe 65 - Just a hair under 4,000 CU INS, this is my multi-day hunting and backpacking pack. It uses the Guide Light MT Frame and the meat shelf makes it easy to pack out A LOT of weight rather comfortably.
3. Mystery Ranch Pintler 38 - About 2,355 CU INS, this is my day hunting pack, also on the Guide Light MT Frame. This was purchased as a bag-only option and I swap it out onto the Terraframe 65's frame for day use. It can also carry a ton of weight, and essentially makes it a two-trip endeavor to carry out an entire buck, one trip if it is boned out meat.
I wouldn't mind trying an SG pack if they had something in the 4,000 CU INS range that also has a meat shelf. The Kifaru 44 Magnum also looks nice, but I don't consider any of these "upgrades" to what I already have. Just different packs of equal quality.