Don't know why you'd feel the need to baby a Leica, they seem to do OK during wars and stuff. Older ones have nothing electronic to get screwed up, I guess you could knock the rangefinder out of alignment but aside from that, they're pretty bullet proof, maybe even literally. I'd be more worried about OP's digital stuff but again pros use these things to shoot wars and they seem to hold up OK.

I stick mine in a Domke insert and stick that in whatever bag I'm carrying. I just pad the bottom of the Domke insert with a cut up mouse pad. I do wish someone made something just like a Domke insert (open top, padded sides, small and not bulky) but one that was made a little better with built in bottom padding.