Now that Canada requires all passengers traveling by air in wear a face mask, we don't expect it to be long before other governments and airlines follow suit. Best to make your own mask, and save the medical-grade ones for essential and healthcare personnel.
This Japanese Creations face mask tutorial—God bless the Japanese—is the easiest DIY option we've seen out there. To make it, all needed is a square handkerchief and two hair ties or rubber bands, no sewing required. Side bonus: It can be thrown in the wash easily, making it reusable.
Though we can go into a lengthy explanation on how to make it, the video is the quickest guide. It is also under two minutes long.
For those curious, here's the official Canadian announcement: "Aviation passengers on all flights departing or arriving at Canadian airports will also be required to demonstrate they have the necessary non-medical mask or face covering during the boarding process otherwise they will not be allowed to continue on their journey." It is in effect as of today.