Durable material, taped, waterproof sealed seams, zippers protected by TPU coating and a flap, as well as the roll-top lid construction, securely protect the contents of the mountaineering backpack from moisture intrusion. Additionally, thoughtfully designed attachment loops and stowable side hip fins not only provide an excellent comfort-to-weight ratio but also allow mountaineers to wear a harness, enabling versatile use of the waterproof backpack.