us postal service flat rate envelope cost

us postal service flat rate envelope cost is a fixed price shipping option from USPS, designed for small and lightweight items that can fit inside a flat rate envelope. This service offers a simple and predictable pricing structure, regardless of the weight of the contents, making it an excellent choice for businesses and individuals shipping documents, small goods, or clothing. Flat rate envelopes are available in different sizes, and the cost depends on the destination and the service level selected, such as Priority Mail or Priority Mail Express.