Need a backcountry buddy that’s both tough as nails and adaptable? The Arva Reactor Flex 40L Pro Airbag Backpack brings the brawn with Cordura Ripstop armor while utilizing Arva’s Flex Frame to swap pack sizes faster than you can say “fresh tracks.” Its REACTOR 2.0 airbag system is lightweight and reliable so you can ride bigger lines with a little more peace of mind.