I use a Lowe Magnum AW. It holds the RZ with prism, back, Winder II, L-grip, and the 110mm, all fitted together. Then there's also space for 3 more lenses, usually something like 37, 50ULD, and 140M/LA or 210 APO, each in their own pouch. In the side pockets I have the polaroid back, 3 hoods, a spare film back, and the 1.4x teleconverter. It's heavy but manageable for short hikes and such. Can take pics of it if need be.
-Ed