thick multi-panel ventilated foam mesh padding design provides extra padding for comfort and maximum Back Support.Sturdy adjustable shoulder straps and soft mesh foam padded top handle for long-time carrying in comfort. Practical --Various pockets are designed very reasonably to organize more easily daily-used items,such as phone,pens,wallet etc.Two elastic mesh pockets at sides for compact umbrella,water bottle. Durable and Fashion --Stylish design,excellent stitching,anti-tear water-resistant top quality and lining makes it not only attractive, but also very durable. Sizes:-Exterior:48x39x18CM/18.9x15.4x7.1Inch,-Laptop sleeve:43x30CM/16.9x11.8Inch, fits most 17 - 17.3 inch Laptops,may not snugly fit all computers due to variations in the sizes of different models.