This technical day pack is loaded with more features than you could imagine. The 40L Revelstoke Technical Pack is ergonomically designed with lightweight, reinforced lumbar support and thoughtfully contoured padded shoulder and waist straps. This bag features an adjustable main hood flap with dual gear pockets, hydration system port and safety whistle as part of the sternum clip. The Revelstoke Technical Day Pack is the ideal pack for day hikes in the mountains.