Hi,
Here is what I do. When finished charging, line up your forefinger, middle finger, and the one next to that (called medicine finger in Japanese) and wind the cable around them carefully so it is free of kinks. You end up with a nice elliptical shape which you can place in a small plastic case or ziplock. Voila!🙂
The first cable I had is kinky but since then they are all in good condition.
Regards.