Last year Boing Boing featured a book called The Englishman who Posted Himself and Other Curious Objects telling the story of W. Reginald Bray, “a stamp collector who experimented with mailing odd objects … through the Royal Mail. … Perhaps most remarkably, he posted himself, becoming the first man to send a human through the mail in 1900, and then, through registered mail, in 1903.” This idea seems to have caught on in other places, as we can see from this image posted on Flickr by the Smithsonian.
This city letter carrier posed for a humorous photograph with a young boy in his mailbag. After parcel post service was introduced in 1913, at least two children were sent by the service. With stamps attached to their clothing, the children rode with railway and city carriers to their destination. The Postmaster General quickly issued a regulation forbidding the sending of children in the mail after hearing of those examples. Smithsonian Institution on Flickr via Kotke.org