Easy to carry and use: hang the key around your waist, you can carry it at any time, you don't need to rummage through your pockets, especially in an emergency, you can find and use the key quickly.
Prevent loss: the key is hung at the waist and relatively fixed on the body, so it is not easy to lose. Once someone tries to steal it, they can find it in time.
Symbolism: In the past, hanging a key around the waist was regarded as a symbol of wealth, because only those who owned real estate and vehicles would have a bunch of keys. Nowadays, this concept is not common, and some people are proud of it and hang their keys in a conspicuous position.
Personal habits and preferences: Some people think that hanging the key around their waist is a personal habit or preference, or a reflection of lifestyle.