Here’s the professional way to send flat but bulky materials- pamphlets, brochures, sales literature, booklets, annual reports, magazines, or catalogs. The flap, usually rectangular in shape, opens as a booklet style flap on the long side for easier filling. Available with moistenable flap, some with self-stick Peel & Seal®. This standard envelope, is great for everyday business, and is the least expensive white paper, but isn't "cheap" looking. These envelopes are made from 24lb paper, measure 6 x 9 inches and are available in a range of styles and sizes; choose the envelope that fits your particular needs.
These window envelopes are the most popular style window envelopes used in business and everyday mailings. These could be printed with a return address in the upper left corner and the address shows through the window.