Weather proof?

I have a great K200D but am worried about my Sigme lenses. I know that the body is ok in some weather but my lenses are the weak link. Could anyone help with some good ideas to protect them from light rain or fog :

Try a grocery store bag. rubber band or tape the bag over the end of the lens and cut out the hole. (I simply used the lens hood to hold the bag in place and it works well. no need for tape or rubber bands)
When traveling, it packs well and if lost (or stolen ) they are easily replaced.

Looks silly, but not as silly as the guy hunched over his camera trying to be a human umbrella.


You can also check out camera shops for more expensive solutions made to allow cameras to be out in the rain, etc...

A slightly chicer solution and nearly as cheap are OpTech rainsleeves.
http://tinyurl.com/66bkfq