There are many types of hooks, there are very standard plastic hooks, there are some strange shapes. Generally speaking, no matter what kind of accessories, the stranger the appearance, the less use it is. Who calls the parents too professional? Here are a few typical introductions.
Plastic hooks are rarely used on plug-in systems, because the things that are out of the box can easily collide during travel, and plastic materials can be easily damaged no matter how hard the texture is.
Generally large hooks are often used on the belts of belt bags or casual school bags. They are used with D-rings on both sides of the bag.
Small hooks are often used in bags to hang some things like keys.
The small-sized hooks are generally used to hang small objects such as small bags, keys and so on.