Zippered Storage for King Blanket (Stoughton/Brockton border)

Looking for a large storage bag for a big, pouffy velvet, king-sized blanket. Doesn't have to be fancy, just zippered and waterproof - even one of the clear plastic ones that a puffy comforter came in would be fine. Can pick up or meet locally, unless you are in the area and want to drop off. :)