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I've got several of those surplus caskets from the Vietnam era. Made out of welded aluminum they are with a big o-ring gas seal between the top and bottom. They have hand clamps to hold the haves together, valves in the end to allow one to introduce an inert gas inside that will hold off corrosion for years.
The best thing they are useful for is storing automotive paints and solvents in. I put the cans into it with the lids tightly sealed. Then I close the lid and tighten the clams. Then I fill it with dry nitrogen from a tank up to 5 psi holding charge.
It's keeps those specialty paints and solvents fresh in their cans for years more than if they sat on a shelf all though the hot summertime heat in the shop.
When I was a kid and had one, I used the top and bottom halves as handy ready to use boats at the lake. Me and my cousins raced in them, paddling them across the lake as fast as we could make them go.
