Pilots and flight attendants were asked about the dark secrets behind the flight industry in a recent Ask Reddit. This is what was revealed.
According to a bag handler on Reddit, bag handlers will ignore warnings or instructions on bags such as "fragile", or "this side up." The Redditor even went as far as to say that they'll do the opposite of what the baggage says because they have to find a way to make all that baggage fit into the cargo pit. However, he did mention that if there is a "i heart baggage handlers" tag on your bag it will get special treatment.