Tool rolls are a fantastic way to keep all your tools organised. Over on YouTube, Darbin Orvar made one specifically for holding and charging up a variety of electronics.
The tool roll itself is made with waxed canvas and works pretty much like any other tool roll you'd use. From there, a set of solar panels are wired into the tool roll so you can charge any electronics you have as long as there's a bit of sunlight. It's a simple, but clever design that could prove useful if you tend to get out into the sun a lot while working. Head over to YouTube for everything you need.