Golden State Overnight does not require that you use GSO packaging for your shipments. You can use your own company envelopes to ship priority letters and your own boxes or tubes for your packages. Envelopes and boxes must be completely sealed and packaging must be appropriate relative to the contents of the package to ensure that no damage will occur during ordinary handling. Golden State Overnight reserves the right to refuse shipment of any package deemed to be unfit for transport.

In order to ensure the proper tracking and security of priority shipments, Golden State Overnight requires a GSO compliant bar-coded tracking label on each shipment. Use any one of the three following methods to prepare a bar-coded tracking label for your packages.

1. Use WebShip on-line shipping at www.gso.com
2. Use ShipGSO Shipping and Tracking Software on your PC
3. Use GSO Manual Airbills