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Interested in learning how to build your own solar backpack? Back in 2009 National Public Radio reporter Jon Kalish ran a story on how to build one:
Sun Inspired: How To Build A Solar Backpack
In this story, the solar panel and associated wiring and electronic components were added to an existing backpack. While this solution may work for some devices, note that it does include support for charging an portable battery, and may not work with larger devices that require a larger capacity solar panel and/or external battery.