Our heavy duty backpack is made of top quality thick polyester fabric. It's waterproof so can protect your things from rain, water, and oil. The multiple pockets can preserve items in classification, which is easy to take in/out. And padded PC compartment will effectively protect your laptop from accident drop. It's a great backpack for men/ women.Kind Notice:Size are manual-measured, there may exist minor inaccuracy of measurement.Due to the monitor color contrast, there may exist a slight color difference between pictures and the real goodsPlease check if the pack is in good condition when you receive the package. If there are problem with the package, please contact us at your earliest convenience