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I still use an F2 from 30+ yrs ago but recently picked up an F-1X, same style just a bit bigger all around. I take 2 2pocket padded inserts and put one on each side, then pack it as follows...
back left - 300
front left - 28 & 50 (a large micro fiber cloth folded in 4s, to separate the lenses)
middle - a gripped 40D, 50D or EOS-3 with 24-85
back right - 100mac & 1.4x T/C (a large micro fiber cloth folded in 4s, to separate the lenses)
front right - 70-200
All four pockets, side and front, are empty and are big enough for a gripped body, and whatever gear you might need to pack. If you don't carry many lenses, only put one insert in the bag; at one end, it leaves an even larger middle area that should hold body w/70-200, hood reversed.
Here's a link to the F-1X, I picked up a used one awhile back and love it; kinda hooked on Domke
Here's a link to the F-1Xs inserts, I use all 3 pictured in different configurations depending on my lens count.
Hope you find what you need...