glassninjaMeet the Lifepack Stealth Backpack: a backpack with a solar panel, power bank, and Bluetooth speakers. It can charge your smartphone up to 6 times. It generates 1 extra charge after 4 hours of sun exposure. The battery lasts up to 96 hours. 
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The bag is water resistant. It comes with a retractable lock to lock all compartments of the bag together.
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