A little history is you please:)
Sending packages via the U.S. Parcel Post Service began on January 1, 1913. Regulations stated that packages could not weigh more than 50 pounds but did not necessarily preclude the sending of children. On February 19, 1914, the parents of four-year-old May Pierstorff mailed her from Grangeville, Idaho to her grandparents in Lewiston, Idaho. Mailing May apparently was cheaper than buying her a train ticket. The little girl wore her 53-cents worth of postal stamps on her jacket as she traveled in the train's mail compartment.