Green Pipe Secret Storage

A model I made because I was bored. I think it has turned out to be quite cool so I just want to share it with everybody! As you can guess by the title it is a green pipe but it has a twist - literally: if you untwist it you can hide stuff in the bottom of it. Afterwards, you can just slide the top on to hide whatever you want to hide! Any feedback would be appreciated as I am new to 3D printing :)