XLab Turbo Rear Hydration System is a great new hydration system that is sure to be a hit. This bike rear hydration system has been proven to have zero drag in high position. This is an added aero advantage when you have to carry additional water bottles. There are many different combinations you can take advantage of with the XLAB Turbo hydration system. You can add an optional Sonic Nut to hold your CO2 and inflator. You can add the TriSports.com bags to hold your spare tires and other items you may need for your next Triathlon race. At this price, you know they are going to be a great bargain.