Backpack Ortovox Free Rider 20 S black Avabag KIT Material: Nylon Avalanche pocket: yes circumferential zip: no back protector: yes backpack volume: 20l attachment equipment: snowshoes, snowboard, helmet, poles, skis, ice ax Weight of avalanche system: 690g removable avalanche system : yes avalanche system included: yes Robust construction, perfect ergonomics, integrated spine protector ultra-light avalanche system AVABAG. Even in this way one could describe in one sentence