Typical backpack fire extinguishers contain __________ of water.

Backpack fire extinguishers are often designed for easy transport in wildland firefighting scenarios, where they can be utilized effectively for spot fires or small blazes. The capacity of these extinguishers typically ranges around 5 gallons (19 liters) of water. This amount provides a sufficient volume for firefighters to manage small fires while still being lightweight enough to carry during extended operations in rugged terrain. A 5-gallon backpack allows for both adequate firefighting capability and manageable weight for the user, enabling them to move quickly in emergency situations.

Smaller capacities, such as 2, 3, or 4 gallons, may not deliver enough fire suppression capability for certain wildfires or may require more frequent refills, which could hinder the effectiveness of rapid response. Thus, 5 gallons is widely recognized as the standard for backpack extinguishers used in these environments.