The Sling from Ful is a Powerbag laptop and accessory backpack that features a 3000 mAh battery. The backpack can house a 14-inch or smaller laptop, in addition to an iPad. The charging system is integrated into the bag, which helps to minimize cable sprawl. Cable connectors include an Apple 30-pin, micro USB and Mini USB. There is also a standard USB port for a user-supplied cable.
The battery is also removable, which allows for swapping of additional batteries, or perhaps lighten the load by about 0.2 lbs. The battery is rechargeable and can recharge right in the bag via an external waterproof charging port.
The Sling bag has a MSRP for $139.99 and retails for below $80. It is available in black, purple, green, gray, red and blue.
