l started to fray after just one day of use!!!Mr March 12, 2012 50Lightweight and high-viz. padded back for comfort and straps to hold against body whilst exercising. headphone hole plus an inner zipped pouch for your music device or valuables such as keys or wallet, saves rummaging. also you put a bladder in this bag as it has h20 technology : ) UK ReturnsFREE UK Exchanges and ReturnsFree exchang