Bandannas are commonly either 17 inches or 22 inches square. The former is good for creating a child's mask, while the latter is more suited to an adult. Bandanna masks have several practical purposes, foremost of which include keeping dirt and debris from entering the mouth and protecting the face from severe wind and cold. Fortunately, tying a bandanna into a mask is a quick and simple endeavor.

Fold the bandanna in half diagonally. Take one corner of the square and fold it down toward the other corner of the square. The bandanna will now be in a triangle shape.

Grab each side of the bandanna. Pick up the bandanna by the two triangle points on the sides.

Place the flat end of the bandanna over your nose. The bottom point of the bandanna triangle will hang down covering your mouth.

Pull the sides of the bandanna and tie them in a square knot behind your hand. A square knot is tied by placing the left end over the right, and then the right end over the left. Pull the knot until the bandanna mask is tightly on your head.