This is much more than a backpack. It's an energy collector that instantly responds to your need to recharge electronic devices using solar power technology. Edgy and masculine, the backpack is designed to support a technological, fashionable, creative mobile lifestyle. Available in either solar or conventional recharge options, this product waves goodbye to the traditional power bank. It is made of EVA, a high-strength, impact-resistant, water-proof and wear-resistant material. The specially designed shoulder strap USB means you don't have to worry about tangled charging cables. The LED ultra-low power cold light panel ensures safe and visible cycling at night.