Compatible Zip-on to Osprey Kamber 22+10 Backpack. Enhance your safety with this bag when skiing and snowboarding in areas with risk of avalanches - note that no activation cartridge is included Good for you who are ski- and snowboard-touring know you will go places with the risk of avalanches. The benefits with the ABS Vario Base Unit Due that it is two airbag-system that is inflated the protection is enhanced - This is called TwinBags You can zip on either the 24liter, 32liter or the 45liter Vario Zip-on bags to bring more safety gear Easily accessible grip plate with trigger More information The bag comes without an activation unit This ABS Vario Base Unit comes with an 8liter bag cover The TwinBags come with a buoyancy volume of 170liter The ergonomic hip belt ensure a tight and comfortable fit Height adjustable chest strap Ergonomically shaped shoulder straps Good to know Educate yourself, make good decisions and seek knowledge before you go Test your gear before going out - like assembling mechanisms