There are 2 type of duty free bags on board. If a pax has no connecting flight, the bag is just a regular white plastic bab. It used to be the Bozano bag. If the pax has a connecting flights, then the tampering bags would be available. These bags are limited and it is being used round trips. It would be a security risk to give it to a passenger unseal . FA has to seal it before handing it to a passenger.