How long do gas masks really last?

How long do gas mask/respirators really last? Do they expire as soon as their shelf life is over? Or do they last forever?
In this video I aim to truthfully answer this question that has plagued Preppers for years.
I also stress the importance of filters in this video, which lots of Preppers seem to forget about.
Support me on Patreon
/ weaponsandstuff93
Please comment, rate and subscribe for more.
Follow me on Facebook and Twitter for updates:
/ weaponsandstuff93
/ weaponsstuff93