This is a Rare Item -The Incredible Hulk Sleeping Bag Marvel Comics Group 1979.  The bag is in very nice used vintage condition with nice bright colors.   The bag is reversible and the metal zipper is in great working condition.  Outside of the bag is cotton and in nice with no rips or tears.  A few white areas have a cream-colored stain. I'm not sure if it can be laundered out.  The inside is a thinner material made out of a yellow acetate/nylon.  The lining has a few small worn thinner spots and one tiny hole due to use and age. The Polyester filling may be uneven at a few places.   Considering the age (45 years old) the bag is quite remarkable. A great item for that enthusiastic collector!