For as long as I could remember I always carry my camera with the lens attached. Unless it's a spare body or really tight for space, I like to have the camera with the lens on, just to save a few seconds. But always ran into a problem that many bags don't hold a body with lens attached that well and the ones that do, they are extremely deep (especially backpacks).
After considering a new bag with lower profile, like the ThinkTank UD60, the camera would only fit without the lens attached. Considering the size and space savings, have most photographers carry their camera body without the lens or not? Figuring not only space savings, it's less stress on the lens mount?