I tour with a micro 4/3 (Olympus PEN EP1) - almost the quality and versatility of a DSLR with much less bulk. I just wrap it in a clean dry t-shirt and the legs of my Gorillapod then stick it in a giant zip-lock bag. In the past, I kept that in a pannier (did about 800 km that way with no problems at all) but this summer I am planning to keep it in a bag on top of my front rack.