Getting ready for a fun run or a day of training? Don't forget your hydration with our 1.5 Liter Hydration bladder, a BPA-free hydration bladder with high-flow bite valves. With the large, easy fill opening allows for a faster set-up in your favorite Nathan Race Vest. When you are all done, you can conveniently wash out your bladder so you are ready for another day on the pavement tomorrow.