That's why Treetools designed the Toucan pouch (vertical and horizontal). Thread the pouch onto your belt and drop in the Toucan. When you want to refuel, just slide out the Toucan and you're in business - better than having your trou around your knees!
The New Zealand made, aluminum Toucan is an excellent 'combi' fuel can for chainsaw operators. One downside for arborists is the belt attachment - it might work OK for forestry workers but taking your belt off and on every time you want to refuel is not very practical for arborists.