Upload & Sell: On
I use a ThinkTank Airport Ultralight and it fits:
1DX with 70-200 II mounted
1Ds Mark II with 35L mounted
16-28 Tokina zoom
1.4x extender, and tubes stacked
1D series charger
Misc. flash accessories (gary fong lightsphere, diffusers)
Small pouches inside the top part hold batteries, business cards, memory cards, wires, and my card reader.
Exterior pouch holds my 15" laptop.
I could fit my 1D Mark III if I sacrificed the charger and put it in my clothes bag or something.
Great backpack with nice wide shoulder straps. Stays very stable on my back, even when I'm jogging through an airport to get to my next flight. Ask me how I know.