Okay, so you're probably wondering, first of all, what the heck a TYVEK bag is. Well, dear viewer, TYVEK is a high-density polyethylene blend of fibers that's lightweight and opaque.
They're rather tear-resistant as well, which makes them excellent materials for things like Express Mail packages at the post office.
Learn how to turn a FedEx mailer into a lunch bag by watching this video!
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