Dredging up this blast from the past......
My first pack was a very small fanny pack w/ a bic lighter, a knife, and a couple Pay-Days that I used for day hunting & WWII pack board for meat hauling.
Then I moved onto an Alice ruck & frame, even making a couple custom slip-on pack boards for it.
This was my first foray into the modular pack concept, I had the ruck slipped on the frame but the ruck bag had it's own set of shoulder straps tucked inside. That way when we killed I could pull the ruck bag off the frame, slip that little alum shelf on, lash a load of meat on the frame and then hand the ruck bag off to my buddy/brother/Dad (none of which even wore a pack of any sort) to haul out the rest.
Then I experimented w/ a cheap ext alum frame pack. It was comfy but was just too tall and cumbersome.
After that I modified a Smart Rig fanny pack w/ shoulder suspension, adding buckles on the back of the shoulder straps to buckle on bladders bags, ruck bags for overnight gear, straps for hauling meat qtr's. That worked well for several years.
Then a buddy loaned me his Nimrod pack, and I fell in love. I got their Pinnacle bag, later added the bladder bag and then the Wilderness gear bag for 3-5 day trips. I liked the modularity of their system but never could wrap my mind a round their frame design. Noisy, loose and unsecure.
Then I played around w/ the Wilderness Pack Specialties packs. The owner sent me 5 of their packs to test and I ended up w/ two I liked that fit my style of hunting, which included a lot of riding & packing w/ mules. In the end I came away with a fondness for their Compact frame and adapted it to my Nimrod harness. Some mods to my nimrod gear bag and I could mount either Nimrod or WPS bag sets of the frame. So now with the stock I just pack my gear bag w/ my clothes & crap in the mule panniers along with the frame which is thin and slides easily in between the pannier bags and one of the coolers. The Pinnacle bag I just attach behind the saddle, and wear the base belt harness, which has all my day gear: radio, gps, binos, filter bottle, and kill kit, a couple bic lighters for fire, and 2-3 power bars. About all a guy needs to jump off a mule and set out on foot w/ rifle in hand after elk. I also designed a couple meat straps that weigh like 2-3oz that allow me to buckle an elk qtr on the back of the base belt harness. This gave me the ability to move meat to a better place to get at it w/ the mules w/o having to have the frame. All this means I hunt super light, but yet have the tools on hand to eliminated needless trips up out of the hell hole we hunt. The only problem w/ the Nimrod/WPS frame combo is the lack of good load lifters. The molle frames WPS uses are just too short for good load lifters. But they are light, short, compact and CAN haul ridiculous loads for short distances. SO it's kinda a double edged sword.
I also have the Oregon Pack Works "Whole Shebang" I don't really care for it due to the total weight, but I do like the "Orion" configuration. I had the Orion before buying the Shebang configuration from a fellow Oregon Rokslider on here. He'd modified the stays with the horz bars mod which I really like a lot. So I sold my original Orion to my hunting buddy and I kept the Shebang for myself. Over-all I really like the OPW design. In a lot of ways it's similar to the Bikini that Kifaru came out with later and both are built like tanks. Both are super airy and comfortable, both USA made and both have excellent warranty & customer service.
On last year's WA Rokslide Hike I got the opportunity to try on some of the Kifaru packs.
I really liked them for backpacking, but IMO they don't fit my style of modularity and mule use. They're just too tall, and if I go w/ the shorter 24" stays I loose the awesome load lifters. And since I don't really do that much back packing having stock, I haven't seen the need to change. But I still admire those K-Packs, particularly the Nomad.
Oh I should mention I have a large Barney style external freighter pack that I use for meat hauling when truck hunting. But again I rely on my Nimrod Base Belt Harness with it's 600ci back pouch and my meat straps to hunt with and get that first load out. After that, I don the freighter and go to work.
My idea of a rokslide is 4 hooves planted with me leaned back in the saddle.
So that's my pack history. For me modularity in the field is King.
Hunt'nFish