is first class mail insured depends on the specific package and additional services selected. Generally, is first class mail insured does not come with built-in insurance, but it can be added for an additional fee. USPS offers optional insurance coverage for items sent via First-Class Mail, which is useful for protecting valuable or fragile items during transit. When you send packages with First-Class Mail, it’s important to consider whether you need to add insurance to ensure coverage in case of loss or damage.