A Shipper’s Letter of Instruction (SLI) is a document a U.S. exporter gives to a freight forwarder or other logistics provider with the details needed to move an international shipment and prepare export paperwork. It tells the parties handling the cargo how the shipment should be described, routed, documented, and presented for export filing, when required.
What it covers
An SLI commonly includes the exporter’s name and address, consignee details, commodity description, weights, values, origin, and the desired mode of transport. It may also state whether the forwarder is authorized to file electronic export information, use a specific carrier, or request special handling such as hazardous materials service or temperature control.
The document does not replace a bill of lading, airway bill, commercial invoice, or customs documents, and it does not transfer title to the goods. Its main role is to give clear instructions so the forwarder can prepare consistent shipping records and avoid delays caused by missing or conflicting information.
Why it matters
For exporters, the SLI helps align the sales team, traffic department, forwarder, and carrier on one set of shipment instructions. In practice, a well-prepared SLI can reduce errors in export data, support compliance checks, and make it easier to book space and arrange pickup, especially when the shipment involves multiple parties or destinations.