Super strong 1860D ballistic nylon, with Solar Charging System (SCS) that can be charged at home or office using an A/C adapter, or with direct sunlight. Fully charged, it provides 8 hours of power. The system works with a cell phone, iPod, iPhone, digital camera, GPS, PDA or MP3 player and includes an AC adapter, USB adapter, and 6 popular cell phone attachments to power them up. There's a laptop sleeve inside the spacious main compartment, a zip compartment up front with a full organizer and plenty of pockets for all your business accessories, a small zip pocket for a phone, keys and incidentals, a mesh water bottle pocket, and a side pocket. The ultra-padded, breathable back and adjustable straps keep you comfortable while commuting.