AlthoughPriority Mail®takes precedence over First-Class Mail® and Retail Ground, you can send larger and oddly-shaped packages through Retail Ground, such as tubes, rolls, and boxes of unusual dimensions. However, you can’t use Retail Ground for packages that measure more than 130 inches...
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USPS. Mailing Standards of the United States Postal Service, International Mail Manual. 2021. Available online:https://navytribe.com/wp-content/uploads/2015/11/imm.pdf(accessed on 21 December 2021). Roby, B.B.; Taufique, Z.; Redmann, A.; Jayawardena, A.D.; Chinnadurai, S. Ethical di...