Also you can descuise it. Dont have it say bitcoin or private key on it. Put it as camo like "Family Pictures Link 2015" or something a "bad guy" would have no interest. And on private key could put picture storage id.
Be creative with it. A little camo like this to hide it and might do a world of good.
Thats is nice but not very sophisticated...
Famili pictures? Nah thats amateur, i mean its a random scribble the private key, so you need some other way to mask the randomness, in a way more creative way.
You just gave me an idea..