http://gpp6nwvsps43b3mfacsh433uroo6uyjvvpr6tgj4jh4n5ngxt7rqbvid.onion/posts/storing-a-sensitive-document.html
With VeraCrypt, a visible encrypted volume can contain within it a hidden encrypted volume, which would be useful in some scenarios. Whether or not this is the best solution for you depends on your threat model.