The problem with most camera-specific packs is the suspension. Suspension is poorly designed, or if well designed, is "one size fits all". F-Stop is a very well designed pack IF your body fits it. F-Stop bags are made for torso length 18" or so - sized for an average build man. They do not fit short-torsoed people even if you fiddle with the load lifters. The F-stop bags have the flexibility needed for carrying variable proportions of camera gear and camping gear. I mail-ordered the 62 liter Satori, and there's no question that the bag can accommodate a DSLR kit plus a long weekend of gear and food/water. I am an inexperienced pack camper, am short-torsoed, approximately 15" - 16", and didn't know about proper suspensions. I used the Satori on a camping trip, found it rode very well on the hips with a 35# load, but my shoulders hurt because the pack straps didn't distribute the load close enough to my upper back despite using the very ample range of adjustments on the pack. I have devised a home-made 2.5 " thick accessory shoulder pad for the Satori to hopefully solve this problem, and will test it under load soon. I hope it works. The access on the F-Stop packs is superb, with a U-shaped giant zipper panel on the foam back panel (actual frame is a wire skeleton instead of a framesheet). You put your pack down on its base or front, unzip back panel to expose the camera unit, unzip camera unit to get at the lenses etc.
There is one commercial (tiny business) photopack from www.photobackpacker.com
that has adjustable torso, adjustable straps, a technical-style pack suspension system based on Granite Gear packs (excellent technical pack company), and it was made originally for ..... VIEW CAMERAS. There is now an insert for DSLRs. The foam padded camera and lens holders attach to a board so that the weight rides against the suspension board, and the front panel of the pack has wide zipper access. If I weren't trying to save my investment in the F-Stop pack, I would have bought this - I found out about this from large format users after I had bought the F-Stop pack. The owner is very responsive, and if you had a special need, he might be able to customize extra D rings, etc. Workmanship is excellent. Owner is a retired engineer and large format photographer.
The other option is to shop around for technical packs that have a way to easily access your camera gear. Most technical packs are top loaders, without significant access to the main compartment from side or front. A few packs have both top and front/side access. If I can't jury rig my existing F-Stop pack for long-hike heavy -load comfort, I may look at the few dual access packs out there and see if my F-Stop camera inserts work in them. Deuter and Granite Gear and possibly Gregory have some pack models of interest.