2-Way Envelopes / Dual Purpose MailersSimilar to collection/remittance envelopes, Dual Purpose envelopes are primarily used for charities, donations, or order forms. The large flap allows for printing on the inside so the user can fill in their information or details. The envelope can be sealed and sent to the recipient, who can then tear off the flap, fill in their information, and put it back in the same envelope, and return to the sender. They are also called 2-way mailers.
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