The Arcteryx Acrux 50 Backpack answers your alpine climbing prayers with 2810cu inches of completely waterproof storage and a weight of only 3lb 11oz regular size. Its seam-taped VaporTight fabric and dry-bag closure keep every drop of moisture away from your belay jacket, sleeping bag, and all other gear packed inside. The Acrux 50 Backpack is the perfect size for alpine routes that are long enough for one or two bivies, and its streamline design is ideal for technical pitches. This Arcteryx pack uses pre-molded shoulder straps to keep you comfortable pitch after pitch. The lid, two aluminum stays, and the pre-molded Binary Hippods are removable for times when you really need to shave ounces. Available for US shipment only.