+1 on the Flipside design. But...I think the Flipside 400 AW might be a bit big - personally, I can fit a gripped body, white zoom (70-200 II, 100-400, 28-300), 4-5 black lenses, a 430 flash, etc. I also have a Flipside 300 for smaller loads - last trip with that, I took a gripped 5DII, 28-300L (same size as 70-200/2.8 ), 135L (same size as 24-105), 35L, and 430EX II - pretty much equivalent to your list.