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What are #9 envelopes and how to get yours custom printed.
#9 envelopes are mailing envelopes measuring 3-7/8" x 8-7/8" and are one of the most popular commercial-sized envelopes available. They are most commonly used as a reply envelopes for invoices and are usually sent to recipients inside #10 envelopes. The best way to custom print yours is by creating a layout/design that is in-line with your brand and other marketing pieces into a PDF file that you can use to order them online or at your preferred printing vendor.