USPS 421 Retail Clerk Complete Practice Exam 2025

Question: 1 / 400

Which item is considered a non-mailable item?

Books

Hazardous materials

Hazardous materials are classified as non-mailable items due to the risks they pose to safety during transport and handling. The United States Postal Service (USPS) strictly regulates the mailing of substances that can potentially cause harm to people, property, or the environment. This includes items like flammable materials, explosives, and toxic substances, which are not permitted to be sent through the mail.

In contrast, books, letters, and postcards fall under categories that are generally accepted for mailing. These items can be safely transported without posing risks to postal workers or the public. Recognizing the types of items that are considered non-mailable helps to ensure that the mailing process remains safe and efficient, adhering to established regulations. Understanding these distinctions is crucial for retail clerks, as it allows them to inform customers accurately and prevent the mailing of prohibited items.

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Letters

Postcards

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