Perfect for travelling or commuting. Simply hook up your audio device/phones inside your bag and then plug your headphones into the port on the side. Same for USB for charging - which goes perfect with my new portable charger (Aka the brick). Well-made bag, and the way the main compartment zip is under the arm straps makes it feel a bit safer when you'r ewearing it in public- harder for someone to ope nyour bag iwthout you noticing!