Mailing Standards of the United States Postal Service Domestic Mail Manual > 200 Commercial Letters, Flats, and ParcelsDesignStandards > 280Commercial MailFirst-Class Package Service —Commercial > 286Enter and Deposit
First-Class Package Service — Commercial parcels must be deposited at locations and times designated by the postmaster. Metered mail must be deposited in locations under the jurisdiction of the licensing Post Office except under 604.4.6.3. Permit imprint mail must be deposited under 604.5.0 and 705.
The USPS may collect First-Class Package Service — Commercial parcels at a mailer‘s facility if part of an approved collection service for other classes of mail; space is available on the transportation; and:
Mailings are subject to USPS procedures to verify correct postage payment. The return of mailings to the mailer‘s facility for reworking is the mailer‘s responsibility.