Lumos Thrillseeker Solar Backpack - Worlds lightest Solar Backpack with 3W Solar Fabric, USB output, hydration-capable Converts sunlight to electricity : innovative solar fabric converts light into electricity, and charges built-in battery By cyclists, for cyclists : water-resistant solar hydration daypack bag with cross-straps, air-flow and hydration hole for maximum comfort Reflective logo and flurescent rain cover for road safety : reflective outline ensures maximum visibility at night Compact design, big capacity : light-weight bags for the mountain biker and daily commuter, water-resistant & protected : water-resistant fabric guards the electronics against rain and saltwater with flouroscenet rain-cover for heavy rains