Size reduction of mailers

A method of preparing a mailer for shipment, the method comprising:

• receiving, into a slot of a forming funnel, a mailer that has an object placed therein, wherein the mailer is capable of being inserted through the slot until a size of the object prevents the mailer from being further inserted through the slot;
• cutting off, by a cutting element as the mailer is slid through the slot in a sliding direction, a portion of the mailer to form a trimmed mailer having a cut end;
• closing, by a fusing device, the cut end of the trimmed mailer as the trimmed mailer is further slid through the slot in the sliding direction;
• identifying, by a computing device, one or more dimensions of the trimmed mailer;
• determining, by a computing device, shipping information for the trimmed mailer, wherein the shipping information is determined based on the identified one or more dimensions of the trimmed mailer;
• and
• printing or applying, by a labelling mechanism, the shipping information on the trimmed mailer.