Meet the Buckshot 2.0: a rugged speaker that attaches to your handlebar or ski pole, and brings you great quality sound. It has a 20 hour battery life and 60 feet of Bluetooth range. You get external controls to change the volume.
Buckshot 2.0 offers 3 mounting options. It has a built-in microphone/speakerphone for calls and chats with Siri. Costs under $40 at this time.