I'm going to make a time capsule. It will be a small transparent box that is decorated with flowers, like these
I'm not going to write anything because I just don't want аnd it's not necessary. I'll keep this with my group in the park. I'll put a badge, a Harry Potter figurine and a small jar of perfume that I don't like in the box to find out if I like them. And I think that's all, because you don't need much.