Is it okay to reuse N95 masks for 3 days and store in a plastic cover? I recently bought a packet of N95 masks. Since they are expensive, I use each mask for 3 days. After each use, I store it in a clean plastic cover. After 3 days, I throw the mask away and use a new one. Is this method safe? Or should I use the mask only one time and throw it immediately? What is the best and safe way to use N95 masks?