Every part of the world has odd customs and behaviors that seem perfectly normal to the people living there. In Australia, the latest trend is to carry your cat around in public while wearing a special cat backpack.
By traveling with a cat in a backpack, the cat is safe and gets as chance to look around at the world. Of course, that also means the human has to lug the weight of a cat around on his or her back. If you think hiking is tough enough with a normal backpack, imagine carrying a cat inside.