How many gallons of water do most backpack pump extinguishers hold?

Most backpack pump extinguishers typically hold between 4 to 8 gallons of water. This capacity strikes a balance between providing enough water to effectively suppress small fires while still allowing the firefighter to carry the unit comfortably on their back. The design of backpack pump extinguishers allows for mobility and ease of use, making them ideal for wildland firefighting and situations where access may be difficult.

Extinguishers with capacities outside this range, such as those that hold less than 4 gallons, would likely not be effective for most fire scenarios due to insufficient water volume. Conversely, units designed to hold more than 8 gallons may compromise portability, making them cumbersome for quick response in rugged terrains.