Does USPS charge by weight or size?

Related questions

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Tags

1. #girth
2. #length
3. #combined
4. #pieces
5. #measuring
6. #charged
7. #price
8. #weighing
9. #piece
10. #mailpiece
11. #traveling
12. #inches
13. #priority
14. #weight
15. #pounds
16. #combination