Sometimes the ride can get sweaty causing much dreaded back patches ventilation on the syncro series is delivered through the airspeed suspended mesh backpanel the airspeed backsystem not only provides increased ventilation but it is flexible enough to move with your body the load is supported at the base of your back with a hip fin at each side to add stability and comfort perfect for commuting or as a small pack for the hills the syncro 15 is packed full of features in a clean modern