Avoiding Condensation with Camera/Lenses

[Satine]

My husband and I are heading over to Canada in Winter 2011 and I want to take my big lenses (400mm f2.8 IS and 200mm f2 IS) and not sure what is the best way to avoid condensation going in and out of the cold weather.

I wasn't going to take the lenses over in their hard travel cases but was thinking that maybe that isn't a wise choice if they can help in any way with condensation. I know about putting your camera/lens in a ziplock bag but not sure they make one big enough for either of those lenses...lol!!

I was just reading an old article in a magazine that photographer Andy Rouse commented he always keeps his camera gear in the tundra vehicles overnight when shooting polar bears to avoid the condensation issue but at some point the camera has to come inside...so what do you do then?