Sometimes, even during the most secret of covert ops, you need to unwind a little. You know - put your weapons aside (but still placed within easy reach) and relax with The Duffel Blog. But what kind of music playback system is best? You sure can’t pack a big boombox into your knapsack, and when the batteries run out, where are you going to find a Radio Shack in Tora Bora? What you need is a small, rugged music player that can recharge on solar power. With carabiner attach points, of course. What you need is an Eton Rugged Rukus.