is this something akin to aluminum foil? Is there a link to some site which explains it's properties.

I still think that adding the two metal plates / rings to the equation prohibits this from attaining the size of a packaged condom. You might get away from the weight problems if you design the article shuch that it uses the altoids tin for the top and bottom plates. This would also alievaite some of the size problems. You would have a packageing / re-assembly problem tho. Hmm......