I did that recently as a backup measure, 1Password comes with a good "emergency kit" that you can print out and store in a safe place. It has instructions on how to access the vault and the password in plain text.

The big advantage of a password manager that is consumer friendly (Like 1Password) is that you can store everything in there (documents, passport, notes) and it will be accessible to whoever needs access to it. Not some obscure command line knowledge necessary.

It is also a lot easier than having hundreds of papers / letters in your house. Even if it's not about the security aspect, having everything in one place is a big advantage.