What are the differences between various comic book bags, such as polyethylene, polypropylene, and Mylar, and how do they impact long-term storage?

What are the differences between various comic book bags, such as polyethylene, polypropylene, and Mylar, and how do they impact long-term storage?
Admin 3 days, 3 hours ago in Comic Book Supplies & Accs
0 Answer(s)