Step 4: Cut a rectangle of paper that is big enough to fit across the entire side of the *inside* of the box. Tape it to the side opposite where you cut the two holes and affixed the foil.

Still, if you want to make a mask, here are simple, step-by-step instructions from the Centers for Disease Control and Prevention on how to do just that, whether or not you know how to sew. Not sure ...

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. For less than $60, BioFace ...