Durable material, taped, waterproof sealed seams, TPU-coated zippers protected by a flap, and the roll-top lid construction securely protect the contents of the mountaineering backpack from moisture intrusion. Additionally, the stowable side hip fins not only provide an excellent comfort-to-weight ratio but also allow mountaineers to wear a harness. Thoughtful attachment loops and compression straps for securing skis enhance the versatile use of the waterproof backpack.