With the development of the times, computers have become an indispensable tool in work and life. Different types of computer bags have been produced according to different needs and uses: laptop sleeve cases, laptop case, laptop backpack, etc. There are also computer bags of different sizes: 10.6, 12.1, 13.3, 14.1, 15.2, 15.4, 17 inches, etc. With the launch of more sizes of notebooks, computer bags are also rapidly launching matching size bags. Now generally 13-15 inch bags are the main ones. The emergence of computer bags also provides convenience for different groups of people: urban commuting, anytime, anywhere, mobile office. Travel, practical storage, no pressure to carry.