Osiris backpack with speakers!! This bag is awesome. Great condition and works well. Battery compartment included to play music in the go. All documents and cables still with it. This an awesome Osiris G-Bag Metatron 2100 Backpack. These backpacks come with built-in speakers and battery-powered amplifiers so you can be on the move with your music and gear. The speakers sound great and the amp provides enough power to get quite loud. The pack is made of heavy duty black nylon and measures about 19"x13"x7" inches. There is a swing-out pouch on the front, storage for 18 CDs, skateboard straps, water bottle holder, and more. The power supply has a switch so you can use it with 110V or 220V power. It is excellent condition with no signs of use. There are some scuffs on the plastic buckles from being in storage. Please see photos.