Do I need an Opal card to get around Sydney, or can I tap my bank card?

Set up a separate valid fare method for each person before the first trip; one adult card cannot record several travellers' journeys or entitlements. If you arrive with children and lots of luggage, compare the airport train's total price, including the station access fee, with a car for the whole group. The train is convenient, but the ordinary Opal fare cap is not the full airport cost.