Weather proof bodies ftw. I've been in super shitty situations with rain, snow, freezing temps (especially in Killington - fuck that) but the bodies and lenses came out fine. It's worth it investing in some weatherproof/resistant gear.
As for the other poster - I use pelican cases for all my gear including my laptop. They're so heavy, but so worth it.
Plastic bags work great in a pinch - rip a hole in the bottom and stick a lens through it and then have the body in the main part of the bag. There's also lens / body covers you can buy which are great for photo at least :)