Good snag, Zig. Your gonna like it. It does work very well on both bodies. I've not configured a good way of packing it in the LowePro Sling 200 bag I have settled on for my E5/E30 outfit that already has one of those bodies, with or without the accessory grip attached and with the 12-60 fitted, the 50mm f2, 50-200 SWD or 70-300 (not both), FL50R and EC20.
It weighs nothin', but the front element is big enough, with or without the hood reversed, that it needs a respectable amount of space.