Features Synthetic 420D nylon, 300D mini-ripstop, 1680 ballistics nylon upper Endorsed by the American Chiropractic Association Tablet sleeve Sternum strap with whistleloc buckle Women-specific fit Description The North Face Women's Surge II Charged is a unique backpack that features Joey battery pack that provides an extra charge for any USB device (phone, MP3 player, tablet, GPS, Bluetooth). You can carry your whole day on your back and stay charged throughout. It's great for long days traveling, taking transit to work or spending time where there are no outlets, like when you're on an overnight outdoor trip. The durable water- and crush-resistant lithium polymer battery lasts longer than conventional portable batteries. You can use the removable Joey battery pack on other bags. Pass-trough charging allows you to charge both Joey battery and your device straight from your bag. Smart technology allows the Joey battery pack to know when to shut down or go into hibernation to protect your device and conserve battery life. Besides of the incredible charging technology of this back pack it features multiple storage spaces that allow you to organized all your essentials with great ease.