do you have to buy usps flat rate boxes

7 Reasons to Consider USPS Flat Rate Shipping | Practical … Flat Rate – Postal Store – USPS.com Results 112 of 16 … Order Priority Mail boxes, shipping labels, flat rate boxes and more. If you’re looking for USPS shipping Read More

flat rate shipping vs standard

7 Reasons to Consider USPS Flat Rate Shipping | Practical … What are the differences between flat rates and standard shipping? This rate is set by the owner of the website itself. Whereas, the standard shipping is the amount set Read More