JAM PAPER Stay-Flat Photo Mailer Envelopes with Peel & Seal Closure - 17 x 21 - Brown Kraft - Sold Individually Brown Kraft Recycled Stay Flat Photo Mailers Size: 17 x 21 inches Quantity: Sold Individually Features a self-adhesive strip for quick and easy closure & is made from 100% recycled content These photo mailing envelopes are available in a variety of sizes.