Sticky stickers on the back are sticky, you can write down what you want to do, then tear it off and put it in a place you can easily see, remind yourself of what to do. And it can also be used to inform people about information, which is very convenient. It is precisely because of this that it is called "poster".
For the sake of beauty, there are more and more styles and colors of convenience stickers.
Convenience stickers are very convenient. In the usual bag, you can bring it in the book. It's easy to solve things that are easy to forget but want to remind yourself.