There's an amazing Canon forum. They have great bag reviews. Just a sec, I'll go get a link...
I'm a new Domke bag owner. I have an F3 (?)==it's the waxed bag.
I carry a D80 with grip attached, a 70-300VR, an 18-200VR, and have lots of room (exterior pocket) for a 600 flash, leaving another exterior pocket for whatever...usually my G11.
Jon is a moderator there, a Domke bag expert (my opinion fwiw), and he posts here.
sabesh post there and here and has written at least one excellent review.
Hope this helps.