I like the largest Crumpler messenger bag with photo insert for my 4x5" Tech V. I've carried it all day with camera, 5 lenses, 4 Grafmatics, the usual accessories, and my tripod on a strap over my shoulder. It's a very easy bag to work out of, with everything accessible. The strap goes across your chest bandolier style, and there's another little strap to keep it straight, so the weight is distributed evenly. The one I have was called the Fux Deluxe when I bought it, but they have some other crazy name for it now.

The Chamonix is smaller than the Technika, so it should even fit in a smaller bag like a Domke F-2, but you would probably need to get different inserts than the one that comes with the bag.