They are really easy to put together and are inexpensive too. There is lots of guidance online about how to put a happy box together, I just googled it!
I have made a video showing some one the things I have put in my happy box, and the reasons behind some of them to show the kind of things that could go into a happy box.
This is not what everyones happy box will look like, because everyone is different and the things that make them happy are also different.
I really apologise for the state of my hair today haha