Men's NATHANA(R) VAPORAIR 7L 2.0 :: New CinchFit gives you a tailored body-mapped fit for all types with the lightweight Men's Nathan VaporAir 7L 2.0. Long runs will never be the same with 2L of liquid back kangaroo pocket and breathable chafe-free materials. Sip from the handy quick release valve and stay seen in low light with 360 degrees of reflectivity.