WebMar 4, 2024 · Shipping Liquids Via USPS A simple user who wants to send some liquid to someone or a new seller just setting up a business that requires mailing services may not know whether it is possible to send liquids via USPS and, if yes, what are the important … WebAug 20, 2024 · Send your letter to: MANAGER, PRODUCT CLASSIFICATION, U.S. POSTAL SERVICE. 475 L’ENFANT PLAZA SW RM 4446. WASHINGTON DC 20260-5015. If USPS approves you to ship via air transportation, they will give you specific instructions on how to label your package and which stickers/markings to add.
343 Flammable and Combustible Liquids (Hazard Class 3) - USPS
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USPS Packaging Instruction 3B Postal Explorer
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