Water resistant heavy duty expandable backpack with a padded notebook compartment inside suitable for 17? Laptops USB outlet to charge your phone from a source inside the backpack (power bank not included). Ergonomic airflow back design with thick but soft multi-panel ventilated cushioning for enhanced support and comfort, alleviating shoulder and neck strain. Handles set on top and side allow it to be carried vertically or horizontally, thick handles are comfortable for long time carrying.