The Backcountry Series packs are comfortable and agile. They feature a perfect blend of suspension, structure, and weight conscious materials. Whether going on a multi day backpacking trip or trekking through Thailand, these packs will accommodate any expedition.Twenty minutes west of Bishop, CA, the Buttermilks climbing area inspired these award winning packs. Lightweight and uncomplicated, this pack was designed to carry all your gear and enable fast movement. Boreas uses their Z foam suspension with more weight conscious materials and construction for these multi day packs.