Dr Satoshi Akima FRACP 『秋間聰』 on Twitter: "TL;DL summary: the pick of the crop is the Aura FFP2 9320+ with blue straps as these last the longest, and in close second place,
30Pack KN95 Face Masks Multicolor, Individually wrapped with Mask Holder, 5-Layer KN95 Safety Masks,Filter Efficiency 95% for Adult Men Women: Amazon.com: Tools & Home Improvement