[err4nt]

ever heard of geocaching? The idea is that you leave things hidden around the world with GPD coordinates and hints of the location and other geocachers will grab their GPD devices (or smartphones) and hunt down your cache based on the location provided and your hints. It's like a big scavenger hunt.

What if you looked up caching 'best practices' for how to safely store items for in the weather, then stashed your valuable information somewhere nobody would find it. Keep track of the location the same way you would a geocache, but obviously don't publish it publicly. Then all you need to do is leave the cache-retrieving information in your legal will and the right people will have access to it at the right time, and it's as safe from prying eyes as you're ever going to get in the meantime :)