Pieces are eligible if not required to be mailed at First-Class rates or not eligible for Periodicals rates. Rate is based on sack level for sacked mail. A certified process must be used at least once a year to ensure accuracy of 5-digit ZIP Codes. Quick Service Guide 050. See below for sack label Line 2 information.
Additional standards apply to mailings of nonidentical-weight pieces.
May use bulk insurance, return receipt for merchandise, and electronic option for Delivery Confirmation. Packaging not required if 10 or fewer pieces fill a sack. For Line 1, use city, state, and 5-digit ZIP Code on mail. For Line 1, use L603 for destination facility. All remaining mail.