Top positive review
Check the expiry date! Masks are certified for 3 years, mine were 2.5 years old on delivery
24 December 2019
Ordered a 20-pack knowing they come with a three year certification, and that 20 should last me around 18-24 months.
Received my box last December 2019, expiry date is May 2020.
If you need the full term of use out of a box, don't buy through Amazon unless you've confirmed the expiry date with them.