A shipper's letter of instruction (SLI) is a document that provides detailed instructions from a shipper to a freight forwarder or shipping company regarding the shipment of goods. It contains important information such as the type of goods being shipped, the quantity, packaging requirements, delivery instructions, and the names and addresses of the shipper, consignee, and any intermediaries involved in the transaction. The SLI is used to ensure that the shipment is properly documented and that all parties involved are aware of the details of the transaction.
