A "domar" is what wildland firefighters pack up the mountains to keep the chainsaw fueled up. It is a two compartmented gas can that holds both fuel and oil for a two cycle small engine that chainsaws commonly have. It also has a small pack attached to it to hold extra chanis, a wrench and screwdriver tool for the saw along with files for sharpening the chain. It is usually toted by putting an axe handle through the gas can handle and hoisted over the shoulder.
To carry the domar a person has to be extemely physically fit in order to tote this 40 pound package up and down steep terrain for miles in the scorching hot sun beside an even hotter fire.
I had to carry the domar in to the fire for 12 miles!