Envelopes are not one-size-fits-all. The flap shape, opening, and proportions signal whether a piece is everyday business correspondence or something more personal and special. Sending the right style makes the contents feel appropriate, a formal invitation in a #10 business envelope feels off, and a routine invoice in a fancy announcement envelope feels fussy. Here is how to choose.
The two families
| Business (commercial) | Announcement (A-style) | |
|---|---|---|
| Opening | Long side | Long side, deeper flap |
| Feel | Professional, everyday | Personal, formal |
| Common sizes | #9, #10 | A2, A6, A7 |
| Best for | Letters, invoices, statements | Invitations, cards, announcements |
Business envelopes
The familiar #10 is the workhorse of business mail: letters, invoices, statements. Its long, efficient shape pairs with standard letterhead folded in thirds. The #9 is its smaller companion, often used as a remittance envelope inside a #10. These are the right call for routine correspondence.
Announcement envelopes
Announcement (A-style) envelopes have a deeper, more decorative flap and proportions suited to cards and folded invitations. They feel more personal and formal, the right choice for grand openings, event invitations, thank-you cards, and holiday greetings, where the envelope itself sets a tone.
Match the envelope style to the message. Routine business mail belongs in #9/#10 commercial envelopes. Invitations, cards, and announcements belong in A-style envelopes, which feel more personal and formal. The right style makes the contents feel intentional.
Brand either style
Both families can be printed with your logo and colors. For events especially, a branded announcement envelope sets the tone before it is opened. See full-color envelope printing and the full envelope sizes guide.
Order the right envelope
We print both business and announcement envelopes in standard sizes. See our envelope options, and read envelope file preparation. Request a free quote.
About the Author
Alaska Business Supply Team
Print Specialists
The Alaska Business Supply team has been printing checks, forms, and stationery for Anchorage businesses since 1979.
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