If you need elastic and can’t find it in stores, here are 2 other possible sources. If you have an ACE bandage sitting around from an old ankle sprain, wash it then cut it into strips of the length you need. OR if you have a bungee cord, slice it open and remove the individual cords. Wash them. The bungee strips may be rougher than other types of elastic which makes the masks harder to wear for long periods of time, but they are durable.
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One caution about wearing masks and respirators is that they can reduce airflow and oxygen. People who are not used to wearing them and or have an underlying condition may become short of breath especially when active, so its important to periodically breath air w/o the mask.