If you want to carry a laptop when you go out, you will definitely use a laptop bag. So, do you know how to buy a laptop bag? Let's listen to what the manufacturer says. 1, shockproof The laptop bag must be able to protect our laptop. Because laptops are made of fragile materials and fine internal structures, they cannot withstand collisions at all. They will inevitably produce vibrations when they are carried out, and sometimes they will run, so a good laptop bag must have good shock resistance. When purchasing, check whether the laptop bag has a special interlayer and inner bag. The thickness of the protective sponge of the inner bag is not enough. Check whether there is a shock-proof cushion sponge at the bottom of the shoulder computer bag. Then check the thickness and uniformity of the inner liner of the computer bag to determine its protective power for the laptop. You can feel the uniform thickness by touching the inner liner with your hands, and the fingers can clearly feel the difference. If these two points are done well, the shock resistance of the laptop bag can be guaranteed. 2, Waterproof The laptop should not be wetted, and when we go out, we will inevitably encounter rainy weather. Therefore, the external material of the computer bag must have a certain degree of waterproof performance. This is very simple. Pour a little water and try it on the laptop bag. The waterproof fabric water will not penetrate immediately, but will flow down the fabric in the form of water droplets. On the other hand, fabrics that are not waterproof will soon soak in the water, and the difference is obvious. 3, comfort The laptop itself has a certain weight, and it will put a certain burden on the body if it is carried on the body. If the laptop bag is not well designed, it will not only be uncomfortable to carry, but it will also affect the movement. Therefore, a good laptop bag can provide people with the best carrying state, which is in line with people's behavior. This must be experienced personally. The hardness, elasticity and exclusion of the backboard are the key points of selection. 4. Size The laptop bag should choose the size that fits the size of your computer. If you choose a 14-inch laptop bag for a 12-inch laptop, the size will not match and there will be space left after installing it, and shockproof will not work. So when choosing a computer bag, you must choose the correct size.