How does Priority Mail work?

Related questions

1. How long does Priority Mail Express International take?
2. Do you have to sign for USPS Priority mail?
3. How safe is priority mail?
4. Can you use your own envelope for priority mail?
5. Is USPS Priority Mail or First Class faster?
6. What is USPS Priority Mail?
7. Is it cheaper to use your own box for priority mail?
8. What's the difference between Priority Mail and Priority Mail Express?
9. Can I use my own box to ship priority mail?
10. Does USPS fly Priority mail?

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