The Mini Tube
This goes along with my earlier links on miniature root cellars for gardens...
$this->bbcode_second_pass_quote('', '[')b]The Food Torpedo (Waterproof PVC Tube)

The principle of the "Torpedo" is a relatively simple one and is
adaptable to many storage uses from food, to storage of
documents, money, priceless photos, and valuables of all kinds.
The torpedo principle is limited only by your own imagination...
...Many years ago, when imaging my "Backyard Survival" plans, two
questions arose. The first was security: What happens if someone
comes along and steals all your food?
6" diameter Schedule 40 P.V.C (which is very thick) and cut it into 4
ft. lengths. This can be adapted as a food storage container (as
the diagram illustrates). Using rubber caps (called "J" caps), which
come supplied with a steel band, the unit can be secured to be both
water and insect proof. I tested mine in a swimming pool.
...In my book I tell the story of how many years after the London
bombing had stopped, the piles of rubble were finally cleared away
to make room for new houses. As the bulldozers worked clearing
the site of each once standing house, the people who had lived
there flocked like birds. As soon as they were able, they pulled
containers of all kinds (glass jars, tin boxes, etc.) from the ground.
Each was recovered with precious contents intact. In many cases,
pictures of sons and daughters lost in combat, family heirlooms,
important records, and other family treasures that would have been
lost in the mass destruction were saved because they were kept
underground all those years, the hiding place known only to the
person who buried such treasures.
http://theepicenter.com/tow04166.html