A hidden paper wallet is considered one of the safest ways to store crypto currencies. You can quite easily create one yourself following the steps at WalletGenerator.net by Michael Mure:
Download and unzip the Wallet Generator zip file from GitHub.
Close your internet connection to be sure that no one is monitoring your computer, tablet or phone.
Open the index.html file in your browser.
Choose your crypto currency and push the Generate new address button.
Print the resulting paper wallet. Do not save the generated crypto keys for the paper wallet on your computer. That’s why it’s called paper wallet, because you keep it on paper. :-)
Close your browser window and empty your browser history and cookies.
Open your internet connection again.
Don’t forget to save your paper wallet in a safe, preferably fire proof, place. To add safety, store the private and public crypto keys in different locations.
Read more at WalletGenerator.net