As important as a chainsaw is to an Arborist, it's of little use when it not accessible. Weaver designs their Bungee Chainsaw Lanyard to stretch when in use and retract when it isn’t. It is 33.5 inches long at rest and 48" long when fully extended. Also, there is a half twist in the loop to keep the chainsaw hanging straight.
The lanyard has one 2" diameter nickel plated ring with a sewn loop and one snap. These lanyards are not designed to tear away.