After some incidents my daily carry pack contains a complete charging system for my electronics in a zippered bag. It contains:

3 AAA batteries,
3 AA batteries.
wall charger with USB cable out.
car charger with USB cable out.
Just Mobile portable battery with USB cable out.
cell phone cable w/ USB male. (Apple)
Tablet cable w/ USB male. (Samsung Galaxy)
portable battery charging cable (also USB to mini USB)
2 sets of $4.00 headphones in individual micro zip lock bags.

This way I can charge in a car, by wall outlet or battery pack which I can also recharge on the go. I can also charge help others out as well. Never know when someone in your group will run out of juice in an electronic device.

The headphones are cheap and designed to give away to friends in need. I use better quality myself and carry those separately.

For Christmas I asked for micro chargers for the wall and car, or to cut down on size, weight.

In my vehicle for trips I bought a $30 charger at a Kinko's that looks like a Grande coffee cup, except the top is two 12 volt plug in's and a USB slot. I've used it to run a laptop, a DVD player and charge a iPod Touch all at the same time. This has also come in handy for people who need to charge their camera batteries and have to bring proprietary wall chargers to do so, like Canon and Olympus.