Pack frames with a shelf are used by elk hunters etc, and the people that make them can supply custom bags. They aren't cheap, but could
be made to carry even an ULF camera. Even dayhiking I prefer a true camping pack. I can slip anything into it - my 8x10 system, my Sinar
Norma, a Pentax 6x7 kit, plus common sense day gear for weather. I get tired having to carry an extra coat and parka on autumn walks into
aspen canyons in the Sierra. There is always some naive hiker or jogger fiver miles back in running shorts, tennis shoes, and a T-shirt - and
then suddenly the sky goes from blue to black and it starts snowing. A twisted ankle or not enough walking speed, and their bodies will be
found during the next summer's thaw. I did my youthful days of ultralight packing and 35mm cameras. Now I'm a big ole self-contained mule
myself, carrying my motorhome on my back. But I do not see much need for a dedicated camera pack with a lot of redundant foam weight,
when a down jacket and some lightwt bubble packing will do just as good a job - and then you're got your coat and parka etc on hand when
you need it. Maybe not for everyone, but I hope to keep backpacking as long as possible with large format equip. I'm in my mid 60's now and
the secret is just staying in shape - lugging that gear up hills every week. Getting a wonderful 8x10 shot in the process is sure a lot nicer
experience than being a rat on a treadmill in some stinky gym.