Race inspired shape and fit keeps the Low Pro Pack out of the way while providing hours of hydration capacity and enough cargo room for energy gels, granola bars or the always handy 20-dollar bill. A 68 oz (2 liter) Hydrapak bladder is included. Hydrapak® 68 oz (2L) reservoir. Detachable hose & slide-top opening. MP3 sleeve. Small zippered pocket for carrying basic essentials for a shorter ride.