At Comic Equip we sell E. Gerber Mylites and BCW Poly-bags. E. Gerber Mylites developed by Ernst Gerber in 1977 and made from Mylar D. Mylites are offered in various sizes including current, silver, golden and magazine. BCW acid-free Poly-bags or polypropylene bags have become the traditional way of storing comics. E. Gerber Mylites are our preferred choice for comic archival sleeves as they will prevent deterioration due to their superior quality over traditional poly-bags. We carry BCW acid-free poly-bags in current, silver and golden age sizes.