Hey wise forumites. I land in Perth from Bali in October and of course clear customs. I plan to purchase duty free alcohol when I land in Perth. So here is my query. I now have a domestic flight from Perth to Melbourne with Jetstar. Can I put my duty free sealed alcohol in my carry on luggage? Or do I have to put it in my checked bag, if that's the case I have to allow for that additional weight of the bottles so I don't breach the excess luggage.