I use Rubbermaid kitchen-sized poly wastebaskets of a size that neatly slips right into the top compartment of the Kelty. That way I can quickly interchange full kits. Side pouches hold the lenses, which largely interchange between various view camera formats, unless I working with MF instead. For long multi-day treks, I don't use that particular system, but do cushion and insulate both my camera and film box with my goosedown jacket (with any potential down-shedding isolated by the jacket being in a plastic garbage can liner, which also keeps the jacket dry in case it rains, as it often does during high country afternoons).
Please note that I'm speaking of REAL Kelty external frame packs of ca 70's - 80's vintage. These still often turn up almost unused. Don't confuse these with neo-Kelty made in China products, which are quite inferior. Nor is this an official "camera pack". It just happens to be excellent for that too, but with plenty of room left over for other gear, clothing, and food.
I'd routinely carry 85 lb loads that way, for days on end in steep terrain. No more. I'll be happy if I'm comfortable carrying 55-60 lbs this summer. Geezerhood has its benefits, but also its shortcomings. Einstein got it all wrong; gravity is not a function of mass but of time - it just keeps tugging a little more as time goes by.
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