Postal mailers with adjustable dimensions

A method for changing the height of a mailer including a first panel, a second panel, and a flap, the flap including a first section attached along a fold line to an edge of the second panel, a second section, and a line of weakening between the first section and the second section, the method comprising:

• placing an article inside a pocket between the first and second panels;
• optionally folding the second section of the flap about the line of weakening relative to the first section so that the second section of the flap contacts the first panel;
• and
• if the second section of the flap is not folded about the line of weakening, folding the first and second sections of the flap about the fold line relative to the second panel so that the second section of the flap contacts the first panel.

An assembly for mailing an article, comprising:

• an envelope;
• a mailer adapted to be inserted into the envelope, the mailer including a first panel, a second panel, a pocket positioned between the first and second panels, an access opening to the pocket, and a flap attached to the first panel and movable relative to the second panel for closing the access opening to the pocket;
• and
• a sleeve positioned inside the pocket of the mailer, the sleeve including a first panel, a second panel joined to the first panel to define a first edge and a second edge, a pocket between the first and second panels, an access opening along a portion of the second edge for accessing the pocket to insert and remove the article, and a false bottom adapted to space the pocket from the first edge.