priority insurance usps is an optional service that can be added when shipping items through USPS Priority Mail or Priority Mail Express. This service provides coverage for lost, damaged, or missing items during transit, offering protection up to a certain amount depending on the value of the item being shipped. For USPS Priority Mail, insurance is included for items up to $50, with an additional cost for higher coverage. Priority Mail Express includes up to $100 in insurance. USPS also offers other forms of insurance for First-Class and other mail services, allowing customers to ensure their valuable items during shipping. Insurance can be easily added when purchasing the shipping label or at the post office.