Thank you i would appreciate that very much your a life saver. It seems that if the grip and a Large zoom like the 24-105 fits in with the 70-200mm plus room to spare it really seems big? do you find that the bag is too big to carry for city and travel? Or is it quite easy?
I checked and the 5D w/ grip, 24-105 w/ hood attached, 70-200 2.8L IS and 580ex all fits if you don't carry the 70-200 hood. The flash fits best if it's out of its case, tilted to a 90-degree angle and placed control-side down with the flash head pointing up. With this arrangement, there is still plenty of room for spare batteries, filters, TC or a small 50mm. The weight will be the only issue if you plan on shouldering it all day.
This is my favorite "go-to" bag when I'm in the city. It doesn't feel big at all and always surprises me at how much it can carry. As always, check it out in person if you can but I'm extremely happy with mine. Good luck and let me know if it works out for you.