Packing

Every postal packet shall be made up and secured in such manner as in the opinion of the Postmaster General is calculated to prevent injury to any other postal packet in course of conveyance, or to any receptacle in which the same is conveyed, 18 or to an officer of the Post Office or other person who may deal with such packet, and where the Postmaster General has made any special rules in relation to the packing of any particular packet or article, such rules shall be observed.