Cover options for winter storage?

[Obliviontoad]

I have the "Official" Honda reccomended cover. I bought it for my Shadow, and found toy delight that it fits my CB quite well... it doesn't do a darn thing about keeping moisture in or out. Every morning, I can count on the bike being wet under the cover if it is outside. I have the corrosion on the engine to prove that. It doesn't keep the rain off, much. I only use it because the people around here have fires, and having a bike covered with oily soot and ashes sucks. my bike winters in an unheated shed, with the cover. I kept tank full of ethanol free gas. But even in the snow belt,I ride at least once or twice a month, no matter what. So it never sits. Never had an issue mechanically with any of my bikes storage wise.