Whether you're trail running or mountain biking, or a bit of both, the Dynafit X7 DY. N. A Hydration Pack will be there to keep you going hard with water, gels, and spare parts. The athletic fit and diagonal construction eliminates swing while you're running or riding, and the moisture wicking back and shoulder straps make for a cool and comfortable fit. A bike carry system with aluminum clasps secures your steed when you're hoofing it up steep and rocky sections of trail or crossing creeks. Put a spare tube, pump, and a few energy gels in the multiple stretch mesh pockets and hit the trail hard with everything you need to finish.