You can learn about the Bulletproof Bitcoin setup at bulletproofbitcoin.com/. These are templates and instructions for ordering metal plates that you can secure together with bolts and nuts. It makes no claims as to durability.
Setup
These plates arrived with a bunch of pre-stamped words; I hand stamped one and dremel etched some as well. The pre-stamped words are really well done.
Heat Stress Test
No data loss.
Corrosion Stress Test
No data loss.
Crush Stress Test
No data loss.
