I gotcha, do you also put one of those (salt?)canisters inside the bag to trap the moisture? Sounds like your car is in good hands
It's a desiccant.
Shouldn't use a car bag (or even a tarp) on an old car without it.
"Store not where moths or rust can destroy..."
Yes, I use the Dessicant, and a good Car Cover under the Car Jacket. Really does a great job. I would recommend it to anyone in colder climates. Oh, and I also throw in a few "dryer sheets" for good measure. I have been told mice hate the smell of them.