"MEGA DEAL" - BCW Current Comic Book COMBO PACK (5 Packs of Backing Boards & 5 Packs of Current Comic Bags) - Comics, Comic Books Archival Storage Collecting Supplies, Thick (7 x 10 1/2) 500 BCW Thick Current Bags and Current Backing Boards Bags are 2 mil material thickness Thick: 7 X 10 1/2 - 1 1/2 inch flap for closure - Crystal clear- Boards are Coated on one side Buffered with 3% calcium carbonate