Flight Attendant Question:

Most airlines will stipulate a set minimum and maximum height limit because of operational reasons which more often than not relate to safety issues. For most, you must have the ability to reach overhead lockers to reach passengers belongings in-flight for both a customer service element and a safety element such as a fluid leak from a bag for example.
However, strangely enough fluid leaking from bags happens infrequently with bottles of baby formula, water, soft drink and the like. Such a 'fluid' leak is for the most part not a real problem but I do one occasion on one of my flights when that fluid turned out to be cigarette lighter fluid.
Lighter fluid is very volatile and the proximity of spark or ignition sources such as light switches and passenger call buttons in the overhead Passenger Service Unit (PSU) on the underside of the over head lockers made for an extremely dangerous situation.