For both domestic and international shipping, cremated remains must be shipped by USPS Priority Mail Express or Priority Mail Express International Service utilizing either a USPS–produced or customer-supplied shipping package. If using a customer-supplied shipping package, it must be strong and durable to withstand transportation handling.
For convenience, the Postal Service has a Priority Mail Express Cremated Remains box that may be used for domestic or international shipments using the applicable Priority Mail Express service. The Priority Mail Express Cremated Remains box can be ordered online at the Postal Store on USPS.com® and is available as part of a kit.
Before closing and sealing the shipping package, the Postal Service recommends adding a slip of paper with both the sender’s and recipient’s address and contact information inside the package. This extra step will help to identify the sender and receiver in the event the shipping label becomes detached.
