I have a Lowepro Stealth Reporter D650 AW. It's a great bag, but fully loaded, it's heavy. Fully loaded in my case means 20D and BG-E2 grip, EF 16-35mm f/2.8L, EF 24-70mm f/2.8L, EF 70-200mm f/2.8L IS, all the hoods and the tripod ring for the 70-200, Speedlite 580EX, batteries, chargers, TC-80N3 remote, cleaning kit, Kata E-702 rain cover, a couple of black sacks (garbage bags for the American readers), WhiBal, various cables, QR plates, a couple of 77mm B+W MRC filters in cases, compass, pen, pencil and Post-It Notes. There's often a Dell Latitude D600 and mouse in the laptop slot, as well as a Pouch 50AW on one side containing a Kensington Lock (yes - I know they're hardly invulnerable) and a Pacsafe 85, which gives a total all up of 14kg.
I wouldn't want to lug that lot round with me all day, but to move all my kit in one go, it's great. I'm off to a meeting tomorrow where I'll need both the Latitude and the camera kit, so everything listed will travel in the D650 AW, and I'll probably put a flattened Targus Notepac in my suitcase along with my DeskJet 450wbt portable printer in its bag (I can take a huge suitcase; I'm travelling by car).
Shooting out of the D650 AW is a dream - it's just moving the thing!
David