Been researching this for the last few weeks & I hear what you are saying..
However me thinks a good solid thumb drive, not a cheapie either would work fine with a few backups & a paper wallet with identical keys stored in a safe place are fine..
If I was to purchase a brand name storage wallet, it should still have a back up..These storage devices are proprietary, so I don't think you can even back them up in the physical sense anyway..
I'm not sure if it's possible to back one of them up on a paper wallet..
Like I said earlier, I'm still researching my options..I am quite tech savvy, & already have the software to create both a electronic & paper wallets..
My plan is to make an electronic off line wallet & then create a paper copy of this wallet to store in a safe place..
I'm also considering encrypting the thumb drive as well..
What do you think Nazmus ??

If you BELIEVE hard enough, it will happen.