| 摘要 |
A mailer provides a new way of securing the delivery of letters, packages, parcels, and/or other items of mail through the U.S. Postal Service. The mailer includes a container and a spacer attached to an inner surface of the container. The container is designed to hold items of mail having an aggregate thickness less than a minimum thickness required to qualify as a First Class Mail parcel. The spacer has a predetermined thickness which causes the first and second sheets of the container to expand to a thickness which equals or exceeds the minimum thickness required to qualify as a First Class Mail parcel. The mailer therefore allows otherwise unqualified mail items to be sent as First Class or special services mail.
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