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I think you'll find those retro leather cases to be unwieldy and unnecessarily heavy, and nowhere near as protective as either of the products you've rejected. I have used several different sizes of Think Tank Holster with no problem; it takes no more than 1.5 second to unzip, and functions as a handy lens changer/temporary holder for lens caps, filter cases etc. when the camera is out. Not only is it well padded, but comes with a rain cover. I haven't needed it, but unzipping the extended would allow use of a 70-200 attached to the camera in a pinch. I use the 20 for my 60D with L-bracket and 17-55 with room to spare.