How To: Make a sturdy lunch bag out of a TYVEK FedEx envelope

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!