USB charging
I rarely ever bother usng the official charger that comes with the device when it needs 5v, opting for USB charging either with a homebrew or pre-made lead.
The great thing about USB charging is that you don't have to carry around a lump of plastic often bigger & heaver than the device it charges. Retractable cables being the easiest to carry around.
It's very easy to make your own USB charging lead for mobile phones (and other 5v requirement devices that don't need more than 500mA) especially when there aren't any official or 3rd party ones available - just buy the cheapest car adaptor you can find, snip off the cigarette lighter plug and and solder on a USB plug.