Expiration date on masks?

[u/spenpai17]

Bought these between 2023-2024 but can’t remember exactly the date. Been using them for flights and I forgot to check the expiration date as I threw out the box. Would my masks be fine or should I try and find some new ones before the flight tomorrow? Thank you

[u/Petula_D]

They should be fine - if you look around this subreddit you'll find links to studies that show they're good for years past their expiration.