Presumably all of these are encrypted or password protected?
The last thing I'd want to create is a physical object wide open to anyone who stumbles across it. It doesn't matter how well it's hidden, it's possible it'll be unearthed and then off floats your cashola.
it is still a ton less risky compared to storing the private keys digitally like on a computer inside a hot wallet or in some text file on your hard disk. worst of all is to store it in the cloud and people these days are using these methods a lot more than paper wallets!!!