Golden State Art, Pack of 100, Acid-Free 8 3/8x 10 1/8 inches Crystal Clear Sleeves Storage Bags for 8x10 Photo Framing Mats Mattes Brand new Pack of 100,8 3/8 x 10 1/8 inches clear Bags for 5x7 photo mats It fits 8x10 double mat with backing. Contains a Re-sealable Adhesive Strip below the opening of the bag.