On a recent trip to Darwin in Australia's Northern Territory, I met a girl from Austria carrying a backpack that would have challenged a weightlifter. She was complaining of back pains and looked miserable. She had received no advice about what to take and included many clothing items because "they might come in handy". Remember, Australia is a warm country and you won't need heavy, bulky clothing. Two items you should not take are bulky winter pajamas and towels. Most hotels and hostels are air conditioned and towels are cheap and easy to hire.