Analysis: The sports armband and the sports armbag are also made of high-quality hook and loop, which is convenient to adjust the size of the armband, and its light and thin material can perfectly fit the arms of most adults. Both men's strong arms and women's slender arms can be exercised by adjusting and firmly wearing sports armbands/sports bags. The transparent sleeve on the surface of the sports armband is convenient for the user interface during sports, and can also be waterproof, sweat-proof and dust-proof. In fact, where do you need time to use the mobile phone interface during exercise? When the real call comes, it seems more convenient to take out your mobile phone and answer it directly. In addition, the side and back of the sports armband are respectively provided with compartments, where keys and change or credit cards can be placed. It is not safe to put money and keys in this compartment, because there will be friction between the armband and the arm during exercise, as well as the friction between internal objects and the armband. Small change, keys and mobile phones are easy to fall off, which is not very practical. Moreover, in terms of price, a sports arm belt costs more than one hundred to several hundred, and a sports arm bag costs only tens of dollars, which is more cost-effective.