Size: 36*20*49 cm (length x width x height). This tactical backpack is big enough to hold your laptop, tablet, phone, wallet, umbrella, water bottle and other essentials. USB interface and American flag velcro designs: You can place a power bank, an external USB charging port to ensure that your phone’s battery is always and everywhere saturated. Material: This military backpack is made of high quality nylon fabric. Waterproof, durable. The age of use is long.