The osprey syncro 15 ensures you arrive at your destination cool calm and collected our syncro series are leaner lighter and faster than ever before taking ventilation to the next level the syncro 15 features our airspeedtrade backsystem and a lightwiretrade frame the pack also has a ventilated biostretchtrade harness further increasing airflow meaning that even on the hottest rides yoursquoll enjoy incredible ventilation and load stability the streamlined profile of the pac