US Postal Service - Express Mail® is now called Priority Mail Express™. Our fastest domestic product available*, it offers the same great service as Express Mail, just with a new name. *
![U.S. Postal Service on X: "Get your free shipping supplies: Flat Rate envelopes, boxes, and more! Shop The Postal Store®. https://t.co/o5h5YwzryJ https://t.co/STLIKgDlhz" / X U.S. Postal Service on X: "Get your free shipping supplies: Flat Rate envelopes, boxes, and more! Shop The Postal Store®. https://t.co/o5h5YwzryJ https://t.co/STLIKgDlhz" / X](https://pbs.twimg.com/media/DRlW_0FWsAA4jZG.jpg)
U.S. Postal Service on X: "Get your free shipping supplies: Flat Rate envelopes, boxes, and more! Shop The Postal Store®. https://t.co/o5h5YwzryJ https://t.co/STLIKgDlhz" / X
![USPS Flat Rate Box Shipping Sizes and Price Breakdown - How to Enable Flat Rate Boxes on WooCommerce - ELEXtensions USPS Flat Rate Box Shipping Sizes and Price Breakdown - How to Enable Flat Rate Boxes on WooCommerce - ELEXtensions](https://cdn.elextensions.com/wp-content/uploads/2018/07/usps-flat-rate.png)