Lowe alpine mountain ascent 4050 backpack the mountain ascent 4050 is the ideal mountaineers pack combining comfort with fully featured design for multi discipline mountain use and hut to hut travel designed with the winter mountaineer firmly in mind this backpack is equipped with our unique double headlocker ice axe attachment system gear loops and ice screw krab slots on the hip belt an under lid rope and crampon strap keeps all your winter kit securely stashed where it is acce easil