... and while we call it a "Zip-Lok" bag, it's much more robust than that. It's a serious, heavy duty "sleeping bag" in which you insert hand-sized bags of desiccant to keep your car's habitat bone dry. My Cobra sits in there from Thanksgiving to Easter. The only other "winterizing" I do to it is fill the tank, pour a bottle of StaBil in it, drive it a bit, pump the tires up to 35 lbs each and, since my Moto-Lita wheel is on a quick release hub, I take the wheel and put it in the closet. A few years ago I went to the trouble of taking hi-def pics of the brake rotors both before going in the bag, and then five months later when it came out. There wasn't even a spot of surface rust on them. Now, just so you know, even with the car in the bag it still must be in a garage. It's not like it can sit out in your back yard.
Here is the bag that I use; it's going to cost you about $250:
Carbag - Protective jackets for your car or motorcycle
EDIT -- And I disconnect the battery too, since it has a quick disconnect on it as well.