Duty Free Security Co. Ltd is a non-profit organisation which has been operating since 1978 and works closely with the Australian Taxation Office and Australian Border Force (previously Australian Customs and Border Protection Service).

Duty Free Security Co. Ltd runs the Sealed Bag System in Australia which enables travellers to purchase goods duty free or tax (GST) free up to 60 days before departing Australia. The sealed bag system is available to retailers in Australia, whether a duty free store, licensed by the Australian Customs (now part of the Department of Immigration and Border Protection) or a general tax free retailer. There are currently in excess of 100 Australian retailers using the sealed bag system.