Laptop bag goes electronic

APC now has a PowerReady line of laptop luggage that includes the external power adapter. It's not clear whether the adapter is integrated into the bag or just a special holder for their standard TravelPower adapter. The interesting point is that it has USB ports to charge other electronic devices such as cell phones and PDAs (each USB adapter is made for a specific device).

One question I have is whether these "all in one" power supplies actually save energy (either because the power supply is more efficient or reducing the number of plugged-in power adapters). At any rate, this is another example of USB as a de facto standard for low-voltage DC power distribution.