What Our Gearhead® Experts Are Saying: "I’ve run this zip-on with a shortened LiTRIC base for longer tours where extra layers, rope, and food are non-negotiable. The 28-liter capacity hits a sweet spot for big days without feeling bulky, and the compression straps do a great job keeping the load stable on the skin track. It’s an easy swap when I know I’ll need more space but don’t want to change my entire airbag setup."We reach for the LiTRIC Tour S 28L Avabag Zip-On Module when the objective stretches farther and the gear list grows longer. Designed by Ortovox to integrate seamlessly with the LiTRIC airbag system, this zip-on module lets us dial in our pack volume without compromising the fit or balance we rely on in the backcountry. From dawn patrol approaches to committing tours with technical transitions, it gives us the space to carry what matters most. Built around a durable 400D nylon construction, the Tour S 28L module offers front-panel access for quick organization and a stable carry thanks to dual-side compression straps. External attachment points handle skis, splitboards, ice axes, helmets, and ropes, making it a versatile option for ski mountaineering and long freeride lines. When conditions or objectives change, this zip-on design lets us adapt our loadout while keeping the same trusted airbag base.