58. Mails for offices with which the branch office is in communication. – The unregistered articles (paid and unpaid) of the letter mail intended for despatch to offices with which the branch office is in communication, should be sorted according to the sorting list, put up in labelled bundles of suitable sizes, tied lightly with thin twine and then placed in the appropriate B.O. bags. Each bag should be labelled with a plain manilla tag label bearing an impression of the label name stamp of the office or section for which it is intended. The words “B.O. bag” should be written in manuscript on the address-side of the label, and the date-stamp should be impressed on the back of the label. The bag should then be closed as described in the last paragraph of rule 129.
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