How does United States Postal Service (USPS) Priority Mail Boxes and Envelopes work? ?

I sell on Ebay. I want to know how these things work. Like what is the price? What does the weight have to be to send it? Stuff like that. Please only serious answers. ThanksHow does United States Postal Service (USPS) Priority Mail Boxes and Envelopes work? ?
flat rate envelope: $4.75

flat rate box: $8-9How does United States Postal Service (USPS) Priority Mail Boxes and Envelopes work? ?
Here, let them explain it all themselves:



http://www.usps.com/prices/priority-mail鈥?/a>



(By the way, media mail rates only apply if you're mailing books, CDs, or DVDs, and media mail can take a lot longer than priority mail to arrive.)How does United States Postal Service (USPS) Priority Mail Boxes and Envelopes work? ?
ask about media mail...it is much cheaper

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