More general pack thoughts:
-Full wrap belt v. lumbar is the big difference, and has been discussed backwards and forwards around here. More than ever I think it comes down to physiology; some people need a lumbar pad, some don't.
-Lumbar pad setups are by their very nature heavier than a full wrap, more material = more weight.
-Being able to adjust frame height with Seek Outside packs is darn handy, and something no one else I can think of makes possible (save McHale).
-SO and Exo are quite similar is their use of horizontal stays to fight barreling and back poking. Exo uses more, lighter and smaller carbon rods. In the Revo SO uses two very beefy alu stays. I suspect Exo has to use lighter ones to maintain flex, while SO can use very rigid 7075 alu because the articulation (at light loads) comes from the joint in the frame.
-The issue of frame width driving bag width and how the frame determines where cubic inches are allocated is a complex one and deserves more consideration. For example, the Exo (and Kifaru and Kuiu) frames need to be fairly narrow at the base because the stays can't be too far apart. The frame needs to interface directly with the lumbar pad for comfort and good lumbar contact, and that limits width to 8-9 inches. To make the bag wider than the frame at the base requires some stabilizing element, for example delta straps on Kifaru. Wider frames, like SO and Outdoorsmans, have a bunch more latitude to make a large bag relatively thin, which is advantageous for good load carriage. The converse is that a wide frame makes constructing a small bag a little more complicated.
-Both SG and MR folks (Black Ovis, actually) said that lacking a dedicated spotter pocket was not a big deal for a lot of folks. There seems to be a big gulf between the two camps on this issue.
-Non meat shelf packs are in the hunting world just about dead. I like a meat shelf for certain applications, but I suspect the bigger driver is that people like being able to swap bags, though I imagine in practice most just use one bag for everything. Hunters are willing to pay a lot more than backpackers for gear, and in terms of the average consumer are less educated and have less experience. By this I mean there are lots of whitetail guys with lots of hunting experience but little wilderness experience who want to put down $500+ on a pack, without having the field time to know what they want. Therefore it's good to be able to buy a frame/bag combo, and only have to switch bags if down the road they want to switch.
Thoughts?