The address your looking for is CarBag.com.
They come in different sizes. I bought one last year for my 69Firebird Conv and it works perfect. It is for inside use only. I store my car in a unheated barn with dirt floor. When I opened it up this spring there was NO rust or dirt and no rodent damage. You put dessicant in when you seal up the bag and it takes out all the moisture therefore no rust, no sweating.
The bag was $229.00 comes with dessicant and worth every penny. The bad side is, once you seal the car, you can't open the bag or you will let in moisture laiden air, and the bag is dark gray, can't see thru it.