Ultimate Guide to USPS Priority Mail Flat Rate Shipping
By A Mystery Man Writer
Description
Learn how to save on your shipping costs and optimize your ecommerce business by using USPS Priority Mail Flat Rate shipping.
![Ultimate Guide to USPS Priority Mail Flat Rate Shipping](https://www.wikihow.com/images/thumb/6/6e/Ship-a-Package-at-the-Post-Office-Step-11.jpg/v4-1200px-Ship-a-Package-at-the-Post-Office-Step-11.jpg)
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USPS First-Class Shipping vs. Shipping with USPS Priority Mail
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per adult (price varies by group size)