Mail Piece Design: Postage is like airline tickets. Some people pay more than others. The United States Postal Service (USPS) offers significant postage discounts to mail pieces that are designed and addressed properly for processing on automated equipment. The following tips will help you safely navigate the complex postal regulations to insure your mail qualifies for the lowest postage rates.
3. Size matters: For lower postage rates, keep your mail piece at letter size.
- Minimum 3 ½” high by 5″ long.
- Maximum 6 1/8″ high by 11 ½” long.
Mail pieces larger than that fall into the flats category and have a significantly higher postage rate. The maximum allowed is 12″ high by 15″ long. Flats can cost more than twice as much per piece as letters.