Pieces are eligible if not required to be mailed at First-Class rates or not eligible for Periodicals rates. Within each package, mailers may combine pieces of nonidentical weights if authorized under P700 . Any mailing job that contains packages of presorted flats and packages of automation flats must be co-trayed using M910.3.0.
Additional standards apply to mailings of nonidentical-weight pieces.
For Line 1, use city, state, and 5-digit ZIP Code on mail. For Line 1, use L004 for destination facility. Any remaining pieces must be packaged in mixed ADC packages. Any remaining packages placed in mixed ADC sacks. No minimum required.