Yes, there's litter in Australia of course, but most Australians are taught from a young age to leave nothing but footprints and trek out whatever they bring with them when moving about a city, a park, wild areas.
Relative lack of litter and glares from Australians when tossing stuff on ground as a tourist is apparently enough to make a number of those daft "10 things about Australia ..." videos and listicles.
Every single other place I go has trash cans. Youth sport league parks, small local city, shopping areas, offices, and downtown urban environments all have trash cans. Especially if it’s an area people walk around.
I made no assumption, I took you at your own word as per your GP comment in which you were quite emphatic.
What?
> Carry your trash with you.
What do you think I did with it? I don't litter.
It's just not at all enjoyable carrying two empty bottles for miles with just my hands while I have other things to carry.