Lumos unPlug Solar Backpack Converts sunlight to electricity : innovative solar fabric converts light into electricity, and charges built-in battery Charge any USB powered device : can charge all phones, bluetooth devices, mp3 player or USB-chargeable bike lights. Battery can be charged externally also By cyclists, for cyclists : water-resistant bag with cross-straps, air-flow and hydration hole for maximum comfort Reflective outline for road safety : reflective outline ensures maximum visibility at night Compact design, big capacity : light-weight bags for the daily commuter, that expand to accomodate overnight travel, water-resistant & protected : water-resistant fabric guards the electronics against rain and saltwater with flouroscenet rain-cover for heavy rains