Thule Men's Capstone Hiking Pack, 40-Liter Shoulder yoke adjusts 4in/10cm to provide a perfect fit for all body types Tensioned mesh back panel provides unparalleled breathability, keeping you cool and dry on the trail Removable rain cover keeps your gear dry during inclement weather Top load, side access and a sleeping bag compartment make it easy to load and unload your gear Hydration compatible design features a reservoir sleeve and drink tube exit port (reservoir sold separately)