Which of the following items is essential in a swiftwater rescue kit?

Throw bags are essential in a swiftwater rescue kit because they are specifically designed for throwing to a person in distress in the water. These bags are filled with rope, allowing rescuers to throw the bag to a victim who may be in a strong current or dangerous situation. The rope enables the rescuer to pull the victim to safety or provide them with a means of support while they are being rescued.

The design of throw bags often includes features such as bright colors for visibility and a streamlined shape that allows for accurate throws, enhancing the effectiveness of rescue efforts. In contrast, the other items listed, while potentially useful in other contexts, do not offer the same immediate utility in a swiftwater rescue scenario. For instance, a fire extinguisher is important in fire emergencies, an emergency blanket is beneficial for warmth in survival situations, and a snow shovel is used for snow removal, none of which directly assist in rescuing someone from fast-moving water. Thus, throw bags are a critical component of a swiftwater rescue kit due to their specific purpose and functionality in emergency situations.