A "Blanket Tramp" is he who carries with him a blanket to shield him, and for this he is frowned upon by the regular tramps and denied the society of that quasi-genteel fraternity, and so has to flock alone. Such is the condition of the hero of our story. In the course of his peregrinations, he passes the Post Office of a small village, and begs for "grub," which the daughter of the old postmaster hands out to him. For this he is grateful and has a chance later to render her a great service, for when the time comes to take the mail to the railroad station and get the incoming mail, the old postmaster is taken ill, and the daughter is obliged to go. The incoming mail contains a pouch of registered matter. Its arrival is witnessed by a couple of real tramps, who make up their minds to get it. This appears easy, when they see into whose custody it is given, the girl's. Their plan would have succeeded had not the "blanket tramp" happened along, who proved the hero of the day.
Moving Picture World synopsis