Perhaps a survival cache is not the optimal approach. Perhaps we should be thinking outside the box.

See what I did there?

The Brits use bothy shelters, NY state uses adirondack lean-to's to provide shelter in wilderness areas. You could add a well or a cache of water and have a relatively high profile, low maintenance solution.
Survival caches come with their own set of limitations-inventory maintenance, rotation of stock, and pilferage. Nothing more attractive than a hidden, sealed box of gear.

...or so I am told.
Dance like you have never been hurt, work like no one is watching,love like you don't need the money.