I got this bag 6 months ago and quite satisfied with it. I am really glad to see this thread hearing a lot of good discussion about the bag I am using!!!
So I want to contribute a little by sharing how I organize the inside of the bag to fit my specific need.
My equipments
-5D with grip
-24-105 F4L
-70-200 F4L
-580EX
-2 baterries for 5D + reserve AA batteries for camera and flash + AA battery slot for grip + some memory cards + rocket blower + some filters, flash diffuser, etc.
-When travelling + 3 battery chargers.
My requirements of the space
-I want to store the camera with either of the lens I have attached without the need of re-arranging the partitions. I want to keep the other lens and flash together in the lower compartment, so I can conveniently throw any other stuffs in the unpadded upper compartment without worring about the safty of my lens each time I open the zipper or want to throw in some junks. And finally, I want my equipments fit in the lower compartment without too much force (I just don't like the feeling of forcing the camera in and out of the bag)
The arrangement
-Use the 2 yellow pads that come with the bag to make 2 small slots inside the compartment. Buy a cheap small pouch (mine with zipper), put batteries and others in it, and place it in front of the 2 slots. Place camera (grip down) in it, the lens portion is supported by the pouch. Just fit my need, and it is simple enough. I am planning to buy 17-40 soon, so when it arrives I think I will move the 580EX to the upper compartment, and place the 17-40 in its place (I think I can put them all in the lower compartment though but I don't want to have it too tight there).
Here is the drawing of the arrangement of the lower compartment (sorry for poor drawing skill
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. I am not available to take the picture of it but with a lot of photos in this thread I think it would be easy to imagine from my drawing.
Not a great contribution, just want to share my part. Hope it is helpful 