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. A certified process must be used at least once a year to ensure accuracy of 5-digit ZIP Codes. See below for sack label Line 2 information. Any mailing job that contains packages of presorted flats and packages of automation flats must be co-sacked using M910.3.0.
Additional standards apply to mailings of nonidentical-weight pieces.
Smaller volume not permitted. For Line 1, use city, state, and 5-digit ZIP Code on mail. Required at 125 pieces or 15 pounds. Smaller volume not permitted. For Line 1, use L004 for destination facility.