The Ghillie camping kettle has a hollow core that holds a small fire of twigs, leaves & other natural biomass fuels as well as the water you need boiled. Fill it with water, then build your fire inside and in 3-5 minutes you’ll be boiling. Nicknamed a “volcano kettle” the Ghillie was designed in the UK and is available in 3 sizes: .5-liter, 1-liter, & 1.5- liter.