Storage Space: Exact size is 14 1/8 inch L x 11 3/8 inch W. It's slightly larger so that it even can comfortably fit picture mat board, canvas panel up to about 1/4 inch thick. Resealable Adhesive: Contains a re-sealable Adhesive Strip on the flap of our bags that you can easily take fine art out. The adhesive is static free and works great for products that require frequent removal, without the worry of a sticky adhesive getting in the way. Acid Free & Durability - These clear bags have Widened adhesive flap, which could keep dust away from for a long time and the color does not fade. There are also various sizes for you to choose. Crystal Clear - Our plastic sleeves are crystal clear so your products will be perfectly visible and your package will be clean, classy and beautiful. Multi Size: We have different sizes of clear photo sleeves, you can choose the right size bags for your photos/prints/artworks. Any question? Please call us at 650-226-8119. The re-sealable adhesive strip is below the opening of the bag instead of on the flap. It can hold one double mat with backing. It can be folded over and sealed over the bag's opening.