Thanks for the photos of the two bags. I have the 300 and configured it a bit differently. Let me see if I can explain it clearly. With gripped body and what ever lens I had attached laying in the middle like you did, I have 3 compartments on top (as bag is worn on back), and two horizontal compartments on the bottom (as bag is worn on back). So looking down on the bag with the whole thing open, I could have my gripped body with any lens in the middle, and on the upper part, two teleconverters stacked in a compartment, a lens area for 18-200 or 30mm, or 17-85, in the middle, and a compartment for my flash battery pack nearest the opening. On the bootom part of the bag, I configured this area to carry my 70-200 f/2.8 horizontally and sealed with a velcro flap. This lens carries nearest my body. On top of that lens--or away from my body, I created a "shelf" from the bag velcro padding to fit my 580EX. The neat thing about this configuration is that I could swap a lens--say 30mm to the 70-200 f/2.8 without taking the bag off, still access the flash, and battery pack, and return them to the bag, and holster the body with any lens I had mounted on it--all without taking off the bag. I admit is necessary to take the bag off to get at the teleconverters, but I don't use them all that often. I think the 200 is more for the XTi size bodies with a 430EX flash and couple of smaller consumer lenses, such as a 70-300 IS and 18-55 kit lens. Both are really nice bags though, and don't be afraid to tear out all the dividers and experiment--it took me a while to come up with what I liked for maximum accessibilty.