What Our Gearhead(R) Experts Are Saying: "I really like the Flex Pro system because it lets me swap pack sizes while keeping the same airbag base. The Reactor 24L is the perfect day-tour size-big enough for avy gear, layers, and food, without being bulky. The Reactor 2. 0 system is super light and well-balanced, so it feels natural even on longer missions." The Arva Reactor 24L Flex Pro Airbag Backpack is designed for backcountry riders who demand a balance of durability, safety, and adaptability. Built with abrasion-resistant Cordura reinforcements, this pack stands up to rough conditions, while the Flex Frame system lets us swap between covers for different pack volumes-all while using the same reliable airbag base unit. At its core is the Reactor 2. 0 system, one of the lightest airbag setups available, weighing just 650g and deploying two independent 75-liter balloons for redundancy in an emergency. The airbag sits compactly against the back panel, maintaining a natural carry and balanced feel on ascents and descents alike. Organization is dialed with a dedicated avy gear pocket, large valuables or goggle stash, and quick front access to the main compartment. Comfort and fit are fine-tuned by the 3D-FIT adjustment system, which adapts instantly to different torso lengths and preferences. Add in diagonal ski carry, snowboard compatibility, hydration support, and a whistle-equipped waist belt, and this pack is ready for full days of exploring big terrain with an extra layer of safety at our back.