Thanks. There are some good suggestions here...I should perhaps elaborate. I'm going to Peru and am trying to not look like I have anything worth stealing. I think that anything that looks like a lap top bag might be in the same category as a camera bag...I have an old back pack that I used last time but it is such a hassle to have to put it down, open it up and balance it while trying to swap a lens (for example). I want to be able to grab a camera out of the bag, shoot, and quickly return camera to bag.
I like the Domke F-6 "Little Smaller" bag...but, not if it's going to draw attention.
A tool bag from the Army/Navy surplus store might fit the bill...