Have you ever been in the airport for 9 hours and wanted to ditch your check baggage? The best, safest and recommended way is to leave your bag at a baggage storage. A locker or a baggage storage service (i.e. http://www.baggagestorage.com.au/).
But what if you don’t have access to a baggage storage place. What if you literally cannot take your checked baggage with you to where you are going? What if you already have a ticket and already at the airport with little or no resources? What can you do?
What totally thing you COULD do.. but you should totally NOT do, is to put you luggage in a bathroom stall and lock if from the outside with a coin.
You should NOT put your baggage in the handicapped stall and lock if from outside because people will think someone is using that stall.
The risk with doing this and leaving your stuff there too long is that someone might just try to go in there anyway.