This instructional is for a home-sewn fabric face mask with a filter pocket. I’ve found that people like different types of attachment (e.g. elastic, ties, etc.). I’m leaving the “how to attach to your face” out because the comfort-value varies so greatly. For myself, I’ve used guyline and cordlocks. DO make sure your attachment is quick, easy-on-easy-off, and doesn’t get tangled in your hair. You don’t want to contaminate everything.
The choice of filter-insert is also up to you. Check out the references section at the bottom of the page. When you Google for filter materials, beware of HEPA bags/filters and Filtrete filters because they are not guaranteed to be safe to breathe through (e.g. might have chemicals or fiberglass fibers).
References
