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A mail bag or mailbag is a generic term for a type of bag used for collecting, carrying, categorizing, and classifying different types of postal material, depending on its priority, destination, and method of transport. It is oftentimes used by a post office system in transporting these different grades of mail.〔However, according to the Oxford English Dictionary, a second definition is "the letters received by a person, especially a public figure." Thus, for example, the "Mailbag special" featuring letter requests from viewers is a recurrent event on Mythbusters.〕 The ''mailbag'' is carried by some means of transporting like a mail carrier, animal (''e.g.'', mule, horse), or a mobile post office. Letters and printed material delivered by mail in the seventeen-hundreds were carried by horse in a saddle bag. There are several different types of ''mailbags'' for different purposes (''e.g.'', transporting mail to and from post offices, delivering mail to businesses and homes. These different styles of mailbags depend on its size and purpose. It can range from "a large bag used for transporting mail on a truck, plane, etc." to a simple "postbag" used by a mail carrier to deliver mail. The idea of having ''mail bags'' on board ships traveling between Jamaica and Great Britain was established as early as 1780. The name of the ship carrying a letter was put on the corner of the letter so that it would be put into the proper ''mail bag'' for the destination intended. A ''mailbag'' throughout the United States history has been called various names depending on its form and function at the time, some of which are now obsolete. Among these names are mail sack, mail satchel, mail pouch, catcher pouch, mochila, and portmanteau.〔<〕〔(Arago Researcher Program Style Guide for Researchers and Editors )〕 Private Mail Bags or so-called "Locked Bags" are a worldwide solution for specialized mail delivery to a single location. Like PO Box addresses, Private Mail Bag addresses omit the name of the building and street, and include only the number allocated to the user.〔(【引用サイトリンク】title=Locked bags )〕 Private Mail Bag addresses are often used in countries in Africa where there may be no street delivery service. In Europe and North America, where street delivery is more commonplace, large users may be allocated their own postal codes, and consequently need only use their physical address in correspondence; the postal code implies that the recipient receives mail by caller service.〔 Private mail bags may be in lieu of a Post Office Box,〔 but sometimes can go so far as to have an individualized corporate zip code.〔For example, the ''Washington Post'' has the unique ZIP code 20071.〕 == Types == The U.S. National Postal Museum says that any bag that carries mail (''e.g.'', letters, magazines, advertisement brochures, packages) is defined as a "Mailbag".〔 A '' mailbag '' is called a ''postbag'' in England.〔(【引用サイトリンク】title=Postbag )〕〔(【引用サイトリンク】title=Postbag )〕 The form and structure of mailbags has implications for fatigue and industrial injuries to mail carriers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mail bag」の詳細全文を読む スポンサード リンク
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