Flat Rate envelopes can also be used for international shipments, to do so use the International window to print postage, addresses and customs forms in one swift operation.The easiest way to print postage for flat rate boxes is to use the Packages window to print out shipping labels - print addresses, postage and tracking information in one easy step and save up to 11% on Priority Mail and 3% on Priority Mail Express.Printing Postage for Priority Mail Flat-Rate Boxes

To order free USPS Flat Rate Boxes or any other free Priority Mail or Priority Mail Express supplies go to the Store. Regardless of the size of the box, you can place whatever will fit comfortably inside (with the box closing securely and with no bulges), so long as the weight is 70 pounds or less and mail it for the flat rate. Postal Service can be an attractive shipping option for small businesses. With this box, you also get a steep discount rate when mailing to an APO or FPO address. Prices vary by product, as shown in the table below. Small: Measures 5-3/8' x 8-5/8' x 1-5/8', making it ideal for smaller items such as books and DVDs. Priority Mail ® service offers a variety of Flat-Rate Boxes and Envelopes that ship for the same price to any domestic address, regardless of how much they weigh or how far they’re going.

There are three types of USPS Priority Mail Flat-Rate Boxes: If you want to ship your valuables through Priority Mail, but are daunted at the rates dependant on distance and weight, the USPS has specially-made boxes that allow you to ship across the country for one low flat rate, regardless of the weight (up to 70 pounds) and distance.

Flat rate box sizes usps