In the Davinci Code, Dan Brown talked about a device called the Cryptex, this is our interpretation of of that device. It works the same way as a bike lock.
Now many people claim this never existed, others say that it did, but the fact of the matter is that it exists today, there are even companies that make bullet proof and fire proof Cryptexes to hide your jewelry and important documents.
The only thing that’s lacking is the actual vinegar flask that’s supposed to “destroy” the hidden package. but eh, it works for what I needed it. You can even hide your USB sticks in here. Or if you want to hide stuff from your parents, or your dorm assistant, now you know where to start.