Luggage sizing?


hello everyone,[br]I am curious what is the exact size of bag/s we are allowed on a tour? My sister told me, but I want to be sure----I want to go to Australia. Thank you for any tips about carry on as well, the rules have changed since I went to Mexico in 2003. I understand we can’t even have a water bottle of our own? [br][br]Do you have any tours that go near Norfolk Island----this place looks great:
and I just wondered about it? Thanks.[br][br]