The R40 PRO FLEX is the rugged and versatile bag that offers a very large 40L volume, ideal for long multi-day tours. Compatible with FLEX technology, you can vary the volume if your needs change.

Learn more about our Flex technology

Tax included
  • Carbon footprint: 48,2 kg CO₂eq (100% offset)
  • Single use plastic used: 25,7g
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With its 40L, you will be able to carry all your equipment necessary to carry out your longest journeys.

Designed to withstand demanding and intensive use, the R40 PRO FLEX's accessories have been designed to adapt to all situations. Perfectly equipped to carry skis, a snowboard or an ice axe, you can also carry your skis diagonally or laterally (A-Frame) to limit the load shift and reduce your effort during the carrying phases. Its safety pocket on the front of the bag makes your shovel and probe accessible in a fraction of a second. Reinforced and optimized to resist moisture and abrasion, your ARVA REACTOR airbag equipped bag will never let you down. With reinforced foam and our 3D-FIT system, you will enjoy maximum comfort that fits all body shapes and sizes.

Discover our FLEX technology

Comprised of the FLEX FRAME base unit and the FLEX COVER 32 PRO pack, you can switch the COVER pack to change the capacity, design, or other functions of your ARVA REACTOR avalanche airbag backpack in just a few seconds.

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  • Reinforced construction for heavy-duty use
  • Inner storage pocket
  • Daisy chain
  • Dedicated snow-safety equipment pocket
  • Quick and easy A-frame ski carry system
  • Gear loops
  • 3D-FIT
  • Reinforced construction for heavy-duty use
  • Inner storage pocket
  • Daisy chain
  • Dedicated snow-safety equipment pocket
  • Quick and easy A-frame ski carry system
  • Gear loops
  • 3D-FIT
  • Reinforced construction for heavy-duty use
    CORDUA is a synthetic fabric with 3 times the abrasion resistance of other typical polyamide fabrics. While durable and incredibly robust, it remains relatively thin and lightweight.

    140Dx210D CORDURA polyamide ripstop HR is a thin fabric with a highly-resistant coating that can withstand the toughest conditions.
  • Inner storage pocket
    Designed to store and organize your small items inside your bag.
  • Daisy chain
    Daisy chains are extremely useful and versatile, allowing you to strap a wide variety of gear to your pack depending on the outing and your immediate need.
  • Dedicated snow-safety equipment pocket
    Since we know just how vital it is to be quick and efficient in rescue situations, we placed a dedicated pocket on the front of the pack for quick access to your shovel and probe.
  • Quick and easy A-frame ski carry system
    Attach skis to your pack in just two clips. The A-frame ski carry system works especially well for wider skis and spreads the load more evenly.

    We recommend also using a strap to attach the ski tips and spread the tails apart.
  • Gear loops
    The waist belt is equipped with gear loops: two small loops on the left, and one large loop on the right.
  • 3D-FIT
    Our 3D-FIT system allows you to quickly adjust your pack to your fit preferences and body size for maximum comfort. Select S, M, or L in just one pull to instantly adjust back height, shoulder strap length, and the position of the REACTOR trigger handle for the perfect fit.


  • Bag only : 1510 g
  • Bag with system : 2160 g
  • Bag + system + carbon canister : 2480 g
  • Bag + system + steel canister : 2650 g
  • Bag + system + US carbon cartridge : 89.24 oz
  • Bag + system + US steel cartridge : 96.6 oz


  • Capacity: 40L.
  • Compatible with our FLEX technology.
  • Front access to main compartment.
  • Quick and easy access flat front panel.
  • Daisy chain modular carrying system
  • Two  axe loops.
  • Quick and easy A-frame or diagonal carry system.
  • Carry options for a snowboard or snowshoes.
  • Compatible with the ARVA helmet holder.
  • Dedicated snow-safety gear pocket.
  • Outside pocket for a mask. 
  • Inside pocket for small valuables.
  • Reinforced front panel made with P140Dx210D CORDURA ripstop HR.
  • Equipped with the ARVA REACTOR 2.0  airbag system.
  • Compatible with our FLEX technology.
  • Waist belt equipped with two side pockets, one is removable.
  • 3D-FIT shoulder straps.
  • Compatible with most hydration systems.
  • Comfortable back panel with thick and sturdy foam padding.
  • Sternum strap includes an emergency whistle.
  • Composition: N330D Ripstop.
  • TUV GS certified.
  • Complies with EN16716 standards.
Flex Technology
We developed Flex technology to allow you to change the carrying capacity of your Arva Reactor avalanche airbag backpack in just a few seconds based on need. This system include the Flex frame and the Flex cover. Our Flex technology does not require any additional zippers, which means no additional weight relative to a traditional reactor backpack.
Arva Flex Technology
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