9 x 12 Booklet Envelope These envelopes have the opening on the long side, making it easy to insert papers, brochures, magazines and more! When you want to avoid folding the contents, this is the best option for you! Moistenable Glue Seal These envelopes are designed with a traditional moistenable adhesive sealing method. Simply moisten the strip of adhesive, apply pressure, and you’ll have the perfect seal. It couldn't be easier! Easily Personalize by Using a Printer Compatible with most digital and offset printers, these envelopes are easy to customize. Print the areas where you need information to be filled out on the inside, so that when the flap is sealed it remains private. LUXPaper is a premium stationery and office supplies brand focused on service, selection, and quality. Our assortment of premium paper ranges from lightweight text stock to heavyweight cover stock, and every weight in between. LUXPaper products, including paper, cardstock, envelopes, and more, are available in a wide selection of sizes and in the largest variety of colors.