The Millet Annapurna 5515 is a high capacity alpine trekking backpack designed for the keen mountaineer and built for mountain environments and long haul destinations. The 5515 liter capacity and Mountain shape feature a generous volume and wide base that accommodate multiple day alpine trekking and backpacking expeditions. Ariaprene foam construction combines a comfortable, soft contact area and enhanced breathability. It also provides a hypoallergenic, anti odor and non toxic innovative and eco friendly alternative. The back panel is supported by a lightweight, internal aluminum frame, while the suspension system, responsible for bearing the weight and connecting it to the body.