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Number 9 envelopes are little enough to fit inside a #10 envelope. When you initiate your monthly reports, bills or a statement application, you’ll often find a tinier white 9 envelope carried inside as a prompt for reserves.
While the 10 envelope is the most common envelope size in the mail stream, the number 9 envelopes are a conventional option. The number 9 envelope is generally practiced in reply mail, everywhere often used to remit payment or send in a statement. 9 envelopes are generally related to as Courtesy Reply Mail (CRM), Business Reply Mail (BRM), or return envelopes.