Made of rugged ballistic nylon, our compact Zip Pocket keeps small items like MP3 players, smart phones, and other digitalia readily accessible and protected from the elements. It attaches easily to shoulder straps or the Modular Accessory Pocket (M.A.P.) system featured on our Urban bags, packs, and totes. It has a kind fleece lining, as well as an internal pocket for small items like earphones and flash memory cards.