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Judging from the way UPS (united parcel smashers) treats their freight, I'd say packaging the tube in the manner described above would be the only way to ensure that it arrived in one piece with vacuum intact.
Sticking the tube in a padded envelope is a recipe for disaster as you can bet with reasonable certainty they'd place (ok, drop) a 40lb box on top of the envelope.
I make sure I buy quantity enough to displace the shipping costs, since the larger box can hold many more tubes safely.
There are many horror stories about UPS on the forums and 'net.
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