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All letter–size pieces must be placed in trays; all flat–sized pieces must be placed in sacks. “Postal Customer” mailings must be prepared as carrier route mailings.
Place each carrier route letter–size bundle in a carrier route tray (mail for only one particular carrier route) or a 5–digit carrier routes tray (mail for two or more routes in one 5–digit ZIP Code area).
Place each carrier route flat–size bundle in a carrier route sack (mail for only one particular carrier route) or a 5–digit carrier routes sack (mail for two or more routes in one 5–digit ZIP Code area) or a 5–digit/scheme carrier routes sack (mail for two or more 5–digit ZIP Codes served by a single delivery unit). Carrier route sacks are required at 125 pieces or 15 pounds of flats for saturation rates.
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