USB & Headphone Ports Design: External USB charging port with build in charging cable,when you are walking by simply connecting your portable charger with electronic device.And the headphone slit enables you to enjoy your favorite music. Comfortable Straps: Serve well as a professional laptop backpack. Adjustable Padded Shoulder Straps for optimal comfort and ergonomic support; Breathable Mesh Back Panels for comfortable carrying. Dimensions: 17.5L x 11.81W x 5.8H, can use as a personal carry-on backpack; Slim lightweight backpack for men and women. Multi Compartments: Multiple pockets keep your items well organized and provide separated space for your Laptop, iPhone, iPad, pen, keys, wallet, books, clothes, water bottle and more. Applicable Occasions & Uses: The backpack is perfect for day-to-day use with minimal weight, can be easily stored. Perfect for going to school, work, weekend get-away, biking, camping, gym, travel, etc.