Also - here is what I can confirm:
400D/ grip & 70-200F2.8L with hood reversed in main
24-105F4LIS w/ hood reversed in right side pocket
Still a good amount of room in the left side pocket.
Ollie,
I am going to be taking up Videography this Fall to add to my Photography at High School Soccer and Football games. I will be carrying both my Rebel XT (with a 70-200 2.8) and a Canon HV20 HighDef camcorder. I have the Lowepro Slingshot and I love it, however I am looking for something that will be a quicker change from video to still and vice versa.
Thus my question, Have you worn this setup (ie the Kata with your 400D a & 70-200) hanging from your belt, or strictly with the shoulder strap? I have read that the Kata has a Belt attachment mesh pocket on the back, but is it comfortable with the camera and a long lens?
Currently Gear-less 
I saw this thread and did some internet searching and came across this picture of the bag on midwestbags.com...

