The Rover AW and the Rover Plus AW come to mind. I have the Plus. It fits great. Has a great hip belt and adjustable shoulder harness. I was truly amazed how well the belts and straps were thought out. A backpackers camera bag! Two weeks ago I carried one for three days with Misc. camera and pano gear, tripod, food/water for two(cause I'm nice like that), and a couple wind breakers. I have no complaints.
I have a Domke branded Kata bag, its much more solid than the Rover, which I also used for a long while. You do have to put the Rover down to get to things. I keep the camera and lenses at the top so I can swing it onto one shoulder to access and I put extras in the bottom part. You can always rearrange the foam to suit... http://www.bhphotovideo.com/bnh/controller/home?A=buyUsed&O=UsedHomePage&Q=222865
Its an old model and I think that's a bargain price compared to the new ones!