I have one in my car and I simply leave it in there. It's very well made and worth the extra $$. Easy to fit and fits very well. You don't lose the rear functionality of the seats, just the storage and aircon vents. Passengers can still sit in the back and use the seatbelts (it's designed that way).
So get one and don't worry about storing it - just leave it in there it works great and very easy to clean.
(it's double layered too, bottom layer is a waterproof membrane/foam product that doesn't scratch the seat material, the top is a faux fur type lining).
I'll get you a photo when I get home from work.
Oh and I've used it to carry an Akita (big heavy dog and she fits in there fine without damaging anything) - one of the best covers I've had.