What are the restrictions on shipping certain items through USPS?

The United States Postal Service has specific restrictions regarding certain items that cannot be shipped or are subject to regulations when using its services. There are various categories of prohibited items which include hazardous materials, explosives, flammable items, poisons, and any substances that may pose a threat to public safety or health. Additionally, items like live animals, firearms, and any form of adult content may have restrictions depending on the service used and the destination. Some items may be allowed to be shipped under certain conditions or using specific services, which necessitates checking with the USPS guidelines. Certain items such as perishables may have limitations around shipping durations to ensure the integrity of the products. It is also important to note that international shipping has its own set of restrictions, and items that are acceptable for domestic shipping may not be allowed when sending packages overseas. For the most accurate and up-to-date information regarding shipping restrictions, it is advisable to consult the USPS website or their online resources, which provide detailed guidance on what can and cannot be shipped through their services.