I've used my AP Sandbag in the past, but that really only works if you're just using the body and lens. Whenever you need/use more lenses or a flash it gets ugly.
At the moment I'm kind off in love with my Domke F2 camerabag. It's a classic that's still being made, and since I started using it I understand why. So simple, so basic and yet so practical. Open the 'lid' with just two clicks and you can reach all your stuff. It's relatively small but still contains loads of camera stuff. Flexible and what's very attractive to me, it doesn't look all too much like a camera bag.
Fit's all this (+ the little snapshot Fuji J20 used to take these pics + all chargers for both camera's, camcorder and battery charger)
Looks like this
I really don't know if I would trade it if Oakley made a specific camera bag...