priority usps flat rate

priority usps flat rate is a service offered by USPS that allows customers to ship packages at a fixed rate, regardless of the weight of the contents, as long as they fit within the dimensions of the flat rate packaging. This service is available for both domestic and international shipments, and it includes options for Priority Mail and Priority Mail Express. The flat rate boxes and envelopes come in various sizes, such as small, medium, and large, and they are ideal for sending items that are heavy or bulky. USPS Priority Mail Flat Rate offers a predictable shipping cost, which can be helpful for budgeting and managing shipping expenses.