145.zip Apr 2026

: All mailpieces must be separated by delivery route or Post Office Box section.

: More than 6-1/8 inches but not more than 12 inches high. 145.zip

: Prepared mail must be presented directly to the specific delivery Post Office or destination unit (DDU/S&DC) responsible for those routes. : All mailpieces must be separated by delivery

: It is a thermoregulating, mid-weight wool-nylon blend designed as a versatile base layer or next-to-skin piece. 145 Mail Preparation - Postal Explorer - USPS 145.zip