If I remember it correctly @adelinamua , Australian flights have a standard of 20kg. They usually only allow about 30kg when you actually have a valid letter (like you are a student you are travelling in / out of Australia) but they would still make you throw things away if it exceeds or fine you a very heavy fee.
From my most recent travel 3 years back, I have learned that even with distance travelling I try my best to travel as light as possible; and before boarding if I have things like a belt, I would have already taken my belt out.
Otherwise it is a real hassle especially when one travels with a laptop (and a few more tech gadgets)
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RE: 3 Lessons From Travelling