A few more words on the Crumpler. It looks like (and in fact is) a messenger bag that you can get with a padded photo insert. It has a big padded strap that goes across your chest so a fair amount of the weight rests comfortably against your back. It's all very well made. I've done day hikes with it and a tripod and a canteen on a shoulder strap, and I've carried it on planes. It holds my Tech V with the grip attached, 6 lenses, shades, filters, meter, finder, loupe, etc., and I usually carry 4 Grafmatics. Eliminate two or three lenses, you could carry twice as much film.
It has a laptop compartment, where I usually put my Grafmatics, but if I'm traveling by plane and need my laptop, I'll put my empty Grafmatics in my checked luggage, carry on the laptop, and put my film in the top of the bag outside the photo insert, usually in a lead bag.
You can also pull out the photo insert with all your equipment neatly packed and have a huge bag to carry other things.