Tyvek was the stuff  used to make the envelopes for the old 5 inch computer
disc. It is also used to package many medical supplies, such as the backing
on IV tubing (Baxter brand for instance). I'm thinking that if you have a
hospital that uses IV tubing, you could ask them to save some of the
containers that it comes in (if they are not cardboard). I'm also thinking
that perhaps your post office there may also have it. Joyce

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