APC Backpack style notebook cases and Messenger Bags are the ideal choice for mobile professionals seeking a more casual means of transporting notebook computers. Each is composed of several compartments, with subdividers and designated pockets specifically for the tools of professionals on the move. The backpacks also include a detachable accessory pouch, bottle holders and adjustment straps for the utmost in versatility. In addition to stand-alone use, each backpack and messenger bag can also be used with APC Universal Power Adapter and Universal Notebook Battery (both sold separately), so you'll always have the power you need to run your notebook computer and mobile devices wherever you go. When used with these universal power electronics, APC Backpack Notebook Cases and Messenger Bags keep your mobile office organized, protected and powered.