Overview Our solar panels are designed to last. Built using rugged fabric and strong solar cells that can withstand the rigors of everyday use (2 years on the solar panel, 1 year on battery pack)HIGH-PERFORMANCE SOLAR PANELS made from industry-leading monocrystalline solar cells charges most smartphones completely in 3.5 hours in direct sunlightSpecificationBag size: mediumCapacity: 20-35LThe internal structure of the bag: zipper pocket, mobile phone pocket, ID pocket, sandwich zipper pocket, computer pocket, camera pocketOpening method: zipper