Reebok Endurance Hydration Back Pack Adjustable padded shoulder and waist straps for secure yet free movement Bite valve for controlled hydration Clip loops on shoulder straps and integrated light bracket for quick LED attachment Large main compartment plus 5 internal pockets and hydration sleeve, plus easy access side pockets for valuables/nutrition Waterproof endurance hydration backpack - 27L total bag capacity with 2L capacity hydration pack