Look at the face on this poor little tacker!
The photo is one of many posted by the Smithsonian (and where I found some pictures for my post back here).
The description of the photo is given:
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.
Thank goodness for that!