These are great to use for flat, bulky materials or multiple small items like coins, catalogs and jumbo cards, direct mail, promotional materials, brochures, organizing documents, distributing marketing materials, mailing or filing. Flap is on the short side, for convenient opening. Open-end style makes it easier to enclose documents. Also called a "catalog" envelope, it actually comes in 39 sizes from tiny to huge, in white, traditional and brown kraft, and array of colors for special impact. Available with moistenable flap, some with self-stick Peel & Seal & reg. This Business-grade, Brown Kraft is actually an orangey brown -- the business color you've seen in the mail all your life. These envelopes are made from 28lb sturdy paper, measure 9 x 12 inches and are available in a range of styles and sizes; choose the envelope that fits your particular needs.