Apparently these giant zip-lock bags that you drive your car into can keep out flood waters! Seems like a great invention, even if you don't live in a flood zone! I'd imagine it would also keep out the 2nd worse problem with storing a vehicle - rodents!
I was kind of surprised that the car started to float away. They might as well put a hook on the bag or provide some suggestion on how to expose a tow hook without compromising the bag.