Which device is specifically designed to contain fire on an aircraft?

The fire containment bag is specifically designed to limit the spread of fire on an aircraft. These bags are made from materials that can withstand high temperatures and are used to encase items that have the potential to ignite or are already on fire. The purpose of the containment bag is to provide a controlled environment where the fire can be contained until it is extinguished or until professional help can address the situation.

The other devices listed serve very different functions. An AED (Automated External Defibrillator) is intended for cardiac emergencies, a POB (Portable Oxygen Bottle) is used to provide supplemental oxygen, and a megaphone is a communication device used to amplify someone's voice. None of these options are designed for fire containment, which reinforces why the fire containment bag is the correct choice for addressing fire emergencies on an aircraft.