120 Preparation for Mailing

121 Packaging — Sender’s Responsibility

It is the responsibility of the sender to prepare items and to address them clearly and correctly. In preparing items for mailing, the sender must (1) use strong envelopes or durable packaging material to prevent deterioration or degradation, and (2) consider the nature of the articles being mailed and the distance they must travel to reach the addressee. (See DMM 601 for detailed instructions.)