Ortovox maintains their tradition of bringing the latest in avalanche safety technology with their new backpacks utilizing the ABS air bag system. ABS has been setting the standards of air bag systems and has been continually developing technology since 1985. WPS now offers the Ortovox avalanche backpacks ABS M.A.S.S. unit (Modular Airbag Safety System) and activation unit separately so you can choose your pack and also purchase replacement airbag and activation units. For more information visit http://abs-airbag.de/en/