Did you look, perchance, at Topeak's little square handle bar bag? I have a larger camera (not an SLR) and it works fine for me. A lot of bike stores carry it.

I kinda liked the look of the Detours better so I was curious to your replies. For example, the Topeak has a waist belt I never use. The belt makes the little side pockets (they're on the belt) almost useless. But the detour has nice little pockets to store snacks and such.