The Power Commute is a standard Timbuk2 messenger bag, but it comes with a separate battery pack. Not available separately, the Joey T1 can recharge a wide range of devices, including smartphones, tablets, cameras, and GPS units.
The T1 can connect to your device via either USB or micro-USB. The ports are housed in a dongle that can reach any of the bag's copious compartments, so that you don't have to remove the Joey from its pouch.
One minor alteration to the bag is a fabric porthole for the T1 dongle to slide through to the laptop and tablet compartment. Using it, you can recharge those devices without having to expose them to the elements.