Just in case I ever need to go to Jandakot
I think it also helps if one gets 'ramp checked' by an FOI. I know I don't have to have one at the places I fly but it's far, far easier to just pull it out of the bag, FOI ticks it off his list and it's one less thing to argue the toss about. I haven't been checked ever in Oz and only a couple of other times around the planet, so I must be due soon