Comic bags are the most common way to protect and preserve your comic books. They are made of 2 mil polypropylene — archival safe with no vinyl, PVC or acid.
Slip your comic into the bag with a backer board behind it (sold separately), fold the flap over and secure with a couple strips of tape.Size 7-1/8" x 10½" + 1½" flap. 100 bags per pack. Price is per pack.
I recently ordered Silver Age comic bags from Hobbymaster and I was very pleased to get them back within 3 days. Amazing!