Question
We're looking for a reply envelope that would fit inside a standard #10 but with a long flap. Does the #9 remittance work?
Answer
Yes. The #9 is the standard reply envelope designed to slip inside a #10, and the remittance version adds the extra-long flap you are looking for.
| Envelope | Size (inches) |
| #9 remittance (reply) | 3 7/8 x 8 7/8 |
| #10 (outer) | 4 1/8 x 9 1/2 |
- The #9 tucks neatly inside a #10 with room to spare.
- The remittance style gives you a long flap for printing instructions or capturing written details.
- This pairing is the classic outer-plus-reply combination used for billing and donation mailers.
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