Question
What is a Side Seam envelope and how does it differ from a Diagonal Seam envelope?
Answer
The seam is where the back panels of an envelope are folded and glued. Invitation A-sizes use side seams, while most commercial envelopes use diagonal seams.
| Seam type | Typical envelopes |
| Side seam | A2, A7, and other A-size invitations |
| Diagonal seam | #9 regular, #10 regular, and commercial sizes |
- Side seams leave a clean, flat back that suits printing and formal looks.
- Diagonal seams are the standard for everyday business mailing envelopes.
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