What size are normal envelopes?

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Tags

1. #which
2. #folded
3. #sheet
4. #these
5. #letters
6. #businesses
7. #mailings
8. #paper
9. #standard
10. #measure
11. #invoices
12. #checks
13. #popoular
14. #envelopes
15. #types
16. #nearly
17. #other
18. #thirds