This is a fantastic idea for sending birthday cheer to someone far away. Birthday in a flat rate box! Fun idea to send to a loved one, too far away to celebrate with!
WTH?! How To Use USPS Priority Regional Flat Rate Boxes | eBay
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Picture of Make USPS Flat Rate shipping box made from a flat rate envelope. I don't have the fancy framework. I just shape the pouch around a book.