The ARVA Switch Tour Bundle is a 2-in-1 freeride and ski mountaineering backpack designed to do it all!In fact, this backpack allows you to choose the volume you prefer: if you are planning a short ski mountaineering trip you can choose the 25l size by attaching the Tour 25 to the frame-back. If, on the other hand, you plan to be away for longer you can attach the 40l volume, the Tour 40, which can expand to 50l.The Airbag is located in the frame, compatible with both volumes. To summarise, the 3 modular parts of the backpack are as follows: the Switch Reactor frame + the Switch Tour25 cover + the Switch Tour40 cover. The avalanche system is the Arva Reactor which provides double safety: 2 separate airbags. It is also the lightest avalanche airbag system on the market: only 680g. It is shaped to protect the head and maximise the avalanche ascent effect, and the trigger handle is ergonomically positioned and designed. It is also an eco-friendly backpack: 100% of the fabrics used for the Tour series are recycled and it is also PFC-Free.   Switch Reactor + Switch Tour25 cover: -Very large pocket for mask or small valuables.-Double ice axe attachment.-Can carry skis diagonally or on an A-Frame.-Integrated helmet holder with storage pocket.   Switch Reactor + Switch Tour40 cover: -Double access to main compartment.-Access from above through rolltop opening.-Complete access to main compartment via zip.-External pocket dedicated to storing safety equipment equipped with storage liners.-Very large pocket for mask or small valuables.-Two expandable, sturdy side pockets for a water bottle or other items.-Double ice axe attachment.-Carry system for the rope.-Convey skis diagonally or on an A-Frame. Splitboard compatible.-Pack volume compression system.-Includes integrated helmet holder with storage pocket. Switch Reactor frame: -Compatible with hydration systems.-Lightweight, soft shoulder straps.-Protective airbag handle pocket.-Thermoulded, comfortable and water-resistant back panel.-Adjustable backrest size from 40 cm to 50 cm.-Security whistle.-Equipped with the ARVA REACTOR airbag system.-Airbag compartment -Right/left adjustable crotch strap. ARVA Switch Tour Bundle (25+40l) avalanche backpack with ABS