These are US Postage Stamps. For collectible stamps, please see Art and Antiques. Example of a prohibited item for shipping: Uncancelled/unused US postage stamps

This refers to soil or soil-enhancing products. Examples of prohibited items for shipping: Dirt Mud Peat Sand Clay

These are items emitting or related to the emission of ionizing radiation or particles. They are typically marked with a radioactive placard. Examples of prohibited items [...]

These are products packaged in containers using pressurized gas. Examples of prohibited items for shipping: Fire Extinguishers Compressed Gas Gas cartridges Helium Propane Car Shock Absorbers

These are pharmaceutical drugs that legally require a medical prescription from a doctor to be dispensed. Examples of prohibited items for shipping: Prescription Drugs Viagra Steroids

This refers to printed or visual material containing the explicit description or display of sexual organs or activity. Examples of prohibited items for shipping: Books Magazines [...]

This category includes printed, audio, or visual material relating to the government or the public affairs of a country. Examples of prohibited items for shipping: Books [...]

This refers to substances capable of causing illness or death when introduced or absorbed by a living organism. Examples of prohibited items for shipping: Class 6.1 [...]

Live plants refer to young trees, vines, shrubs, or herbs planted or suitable for planting. Dead or dried plants are also included. Examples of prohibited items [...]