Golden State Art, 100- 8 1/4 x 10 1/8 clear Bag for 8x10 mat matting 100- 8 1/4 x 10 1/8 clear Bag for 8x10 mat matting Actual size:8-1/2 x 10-3/8"+ Flap 1 1/4" (Fits 8 x 10" 4-ply mat or 8-ply with backing)