The MYSTERY RANCH Coulee 40L Backpack is sized to carry everything needed for our day hikes across grueling terrain and minimalist overnights. It's designed with an ingenious 3-zip opening for speedy access to all our essentials and features an adjustable yoke for a truly customized, back-cradling fit. Numerous pockets throughout the lid, sides, front, and hip belt organize all our gear and larger items. Plus, with tool attachment points and a hydration-compatible design, this pack is as about as versatile as they come.