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Indispensable for the student or professional whose computer must always be charged, this solidly designed and comfortable backpack sports three sturdy, waterproof solar panels that provide power via a custom battery pack. While only one device can be charged at a time, the newest Voltaic generator can produce up to 14.7 watts, which is enough to fully charge a typical laptop from one day of direct sunlight. The company offers an extensive number of power tips for easy connection to various devices, and even without an adapter, a standard car charger will usually do the trick.