The USPS Priority Mail Flat Rate Envelope EP14F is a versatile and convenient shipping solution. Measuring 12 1/2 x 9 1/2 inches, this envelope is ideal for sending letters, documents, and small items. Created by the United States Postal Service, it ensures reliable and efficient delivery, making it a trusted choice for businesses and individuals looking to mail items quickly and securely. The flat rate design also provides cost savings when shipping multiple items of a similar size.