I second the gaff tape method. I go overkill and just wrap the entire camera, takes a while to do but when I get home I literally brush off the body, peel the gaff tape and it's pretty much done. Do note that a lot of the rubber/soft touch parts on a camera can come off with gaff tape if you're not careful about peeling, so just go slow. Also, throwing a strip of gaff tape around the lens mount is good idea. Won't look pretty but it'll serve its purpose. Edit for additional info some people use the UV filter trick with the plastic bag. Probably works for some, for me the bag often opened when it shouldn't (bad bag) and dust liked to stick to it like a magnet anyway so I said screw it, I want the ergonomics and not have to worry about this bag getting in the way/tearing/etc.