DESC: Perfect for going to work ? or escaping it ? we?ve rebuilt our Lightwire 25 to incorporate recycled materials. Its fully padded computer sleeve protects a 17-inch Mac or 15-inch PC laptop, the dedicated flat storage section holds files and magazines, and an external pocket offers one-handed access to an office pocket organizer. The Lightwire is also a serious daypack with plenty of room for a jacket and lunch. Highly breathable 3-D spacer-mesh shoulder straps and back panel wick moisture away. Other features include: an MP3 pocket, sternum strap with built-in safety whistle, a tuck-away waistbelt, a stretch water-bottle pocket and an easy-access external security pocket. Made from tough 300-denier polyester (47% recycled) doubleweave with a polyurethane coating and DWR (durable water repellent) finish.