Australian customs have strict policies on what can be brought inside the Australian border. You need to be aware of what you cannot bring into Australia and therefore what you should not pack. It is also important that your family and friends at home are aware of what they cannot send to you through the mail.
Australia has a unique natural environment that is free from many of the pests and diseases found elsewhere in the world. It is therefore important for Australia to prevent the potential introduction of exotic pests and possible diseases from outsides.
Many foodstuffs, plants and animal products may not be brought into Australia. Passengers coming into Australia are required by law to declare such items on the Incoming Passenger Card (which you will receive on the plane before disembarkation) no matter how small or trivial they may seem.
Aside from quarantine issues, when travelling to Australia, if you are carrying a total of AUS$10,000 or more, or equivalent in foreign currency, you must declare the money on your Incoming Passenger Card and when questioned by Australian Customs officials upon arrival. If you dont declare this money, it may result in the money being taken and you being punished by imprisonment.
There is no limit to the amount of Australian or foreign currency you bring with you, but it is an offence not declaring the money.