Engrave your private keys in a block of tungsten, basically indestructible.
the key is exposed too much in this way, not only because it is there well put on show, but because that thing is also heavy to carry around and big....
I think you are missing the point, if you are making a long term storage of your private key then is it properly not a good idea to either "put them on display" or carry them around.
there may be the need to move that thing at some point, maybe because you need those coins desperately, maybe because you are changing your appartement, that what i mean
do not take everything for granted, little problems always arise, and thus problem lead to a big problem some times