Nowadays, you could probably make an SSD that looks like an old 3’’ floppy. Might get a bit hot (because of very little airflow and thermal paste) but it could carry plenty of chips/terabytes, in all that space. Add a protected USB-C socket, and at the other end a flexible dock-attachment (like the Nintendo Switch) that looks like an old drive, and you’d have a very retro-looking removable-storage system you can point the kids at.
And Child would ask their mum and dad why have they 3D Printed the Save Icon. ( And this is not a Joke )