Encourage Fast Responses with #9 Return Envelopes #9 envelopes are great for business reply mail as they fit comfortably inside a larger (most commonly #10) envelope. Most commonly, #9 envelopes are used for the recipient to return something to the sender, typically in regards to an invoice, donation, or business mailing. By eliminating the need for the recipient to provide their own envelope, #9 envelopes can help you receive more and faster responses. #9 envelopes can be printed full color on the front (no bleeds). #9 Envelopes FAQ What's the best use for envelopes like these?#9 envelopes are the most popular envelope for reply mail. Enclose these inside a standard #10 envelope to encourage recipients to submit payment, complete a form, or send back a donation. Are these gum-sealed? Yes, our # 6 3/4 envelopes are gum sealed, which means they have a water soluble gum strip that you lick to seal the envelope. What type of flap does this envelope have?#9 envelopes have a regular commercial style flap. What's the difference between business reply and courtesy reply mail? With courtesy reply mail, the recipient is responsible for paying postage to return to the sender. With business reply mail, the sender has already paid postage on the envelope for the recipient. For a sender to utilize business reply mail, they must have a permit with USPS. Courtesy reply mail is most popular for invoices, whereas business reply mail is most common for donations and tithings. Can I print envelopes with a full bleed on the sides?At this time, we cannot print envelopes that bleed off the edges. We need at least a .125” blank margin around all sides for proper printing.