[Az-Geocaching] Eternal Cache Container

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Author: Lasivian
Date:  
To: az-geocaching
Old-Topics: RE: [Az-Geocaching] Maps!!
Subject: [Az-Geocaching] Eternal Cache Container
ok, I need ideas for a cache container for a cache that might be
found once a year, or once every 10 years even

requirements:

Rustproof
Airtight
Photo-resistant (Sun won't rot it)
Internal size at least 1728 cubic inches (ie, 12"x12"x12", but the
shape doesn't matter)
Must be resitant to stress/impacts (ie. if it breaks when I hit it with
a hammer, or I can bend it in half it's no good)
Can't have keys/lock (tho a combination lock might not be bad)

my general target is a minimum of 100 years, it will be hidden in
Arizona

so far the only thing I can think of is a custom-built stainless
"Container", or maybe a Sentry-type firesafe

thanks