For those wanting to get the latest solar bag without shelling out the extra dough, you’ll find that you can make your own solar bag - right at home.
Based on instructions from PopSci, Talk2Shirts gives DIY instructions on how to integrate a solar panel into a bag going over both material specifications and electronic installation inside the bag to generate the electricity.
They found that walking through the city not only a sunny day but near glass and bright stone produced great results due to additional lighting from surface reflections. Beaches and near pools ran at full performance, at no surprise. The solar bag performs well with iPods and other USB powered devices if exposed to sun about 70% of the time. If exposed to less than 70%, then a storage battery is recommended.