I recently flew from Singapore to Perth with Qantas with only carry on baggage. At no point was our baggage weighed. This wasn't a problem for me as I normally stick within the limits to avoid any problems. My friend just flew Perth to Ho Chi Minh on Scoot and on the Singapore to Ho Chi Minh leg was allowed 10 kgs between 2 bags. She was by no means the last passenger but as she boarded she was told there was no space in the overhead lockers so her carry on luggage had to be put underneath. This happened with other passengers as well and resulted in the flight being delayed by 1 hour. Has anyone else experienced the same situation?