5x7 envelopes - Look no further, this hard-to-find open end, multipurpose envelope tells the recipient that you wanted to use the best! Great for sending flat, bulky materials or multiple small items like coins, catalogs and jumbo cards. Flap is on the short side, helping to keep things from falling out after opening. Also called a "catalog" envelope, it is available in various sizes and an array of colors for a special impact.