One of the best inventions I've seen, and I almost threw it away without
noticing! This came from Amazon, and originally contained something
quite different from a jam jar, which is just for illustration. Using
just one piece of cardboard and one piece of plastic film, Amazon can
pack and ship pretty much anything that fits in the box, and it will not
rattle, not jolt and not get crushed. In fact, it won't even touch the
sides of the box. No doubt it is really quick to pack too. Amazing.