Which of the following is a key piece of equipment found in the overhead bin?

The correct answer is a key piece of equipment you would find in the overhead bin is the oxygen mask. In commercial aviation, the overhead compartment is typically used to store safety equipment, including oxygen masks, which are essential for passenger safety in the event of a loss of cabin pressure. These masks are deployed automatically in such emergencies, ensuring that passengers have the necessary oxygen to breathe in case of an emergency situation.

While options like a megaphone and earpiece relate to communication tools, they are not stored in overhead bins. Similarly, a life vest is generally stowed beneath the passenger seats to provide immediate access in case of an overwater emergency. The presence of the oxygen mask in the overhead bin aligns with safety protocols that ensure effective emergency preparedness onboard the aircraft.