Abstract: A mailer can include an envelope and an enclosure. A method can include: a) providing a blank with envelope and enclosure portions connected by a joint; b) folding and securing the blank such that the envelope portion forms a pouch, the pouch substantially containing the enclosure portion, the pouch being open at one end and having major surfaces, one major surface including the joint at or adjacent the open end, and another major surface including a closure flap extending from the open end beyond the joint; c) reversibly deflecting the flap away from the joint to thereby expose the joint; d) severing the joint while it is exposed; e) folding the closure flap and securing it to the one major surface to close the pouch and secure the enclosure within the pouch. An apparatus can be configured to carry out the above method.