Or you can just use VeraCrypt container set to use a hidden volume and store it there.

VeraCrypt is a opensource encryption software capable of creating special hidden volumes with strong 3 times encryption.
It works like this. The volume has two parts a "public" part that you fill up with sensitive looking data but it is fake, it is something you intend to disclose and what looks like something worth hiding. Like your collection of weird but legal hardcore bdsm piss gay porn.
Than it has a hidden part with a separate password that actually contains the protected data. Provided you use it correctly, the hidden part should not be detectable. Veracrypt has a nice tutorial on creating the volumes so do not be afraid to use it.
Use strong, long, complicated passwords and do not use Windows

As that system has spying built into it and is proud of it. If you forget your password do not worry about it, NSA will send it to you the next day.