I'm getting TSA approved locks, which means I can lock them, but TSA is allowed to open them. I don't know how that works, but it's what I'm doing.
I'm flying from Chicago to Los Angeles, and then Los Angeles to Brisbane. Brisbane to Cairns and then Cairns to Brisbane. My flight from LA takes off at 11:35 pm. I plan to sleep on the flight, but I'm not going to sleep 14 hours.