I personally have found I tend to prefer Domke bags. They are not as padded as lots of other camera bags, which may turn some people off, but it part of what I like about them. It makes them more flexible in terms of fitting and arranging the contents of the bag. A number of years ago I bought the F-803 satchel. The idea was to fit a DSLR with big zoom, plus have space for several other medium to large lenses. It worked well for that. When I moved back to film, I used it for my F4 (my largest 35mm camera) and it worked well for that. I took it to Russia with my Pentax MZ-S with 5 lenses, and a Kodak Retina.
When I started shooting medium format, I found I could fit my Bronica ETRSi with 3 lenses, 5roll case of film, extra back, and meter. It worked great for that too. Then I got a Bronica GS-1 (6x7, but a little smaller than the RB), and I could fit the GS-1, 3 lenses, 5 rolls of film, and meter (but not a second back). And it works great for that as well, but it is a little tight, so I doubt the RB could use it.
I have a Domke F-2, which would probably suit the OPs needs, but I use it for my Linhof Technika, 4 lenses, 6 film holders, meter, dark cloth, and whatever misc LF accessories I need to bring. The only camera I have that I haven’t found a good fitting Domke bag for is the Technikardan. It’s just not the right shape—about the size of a first year calculus textbook.