20 new Swiss NATO gas mask filters for $23

[nola_]

http://www.sportsmansguide.com/net/cb/cb.aspx?a=680117

Individually sealed in "shell", 40mm threading (fits any 40mm mask)

 

[kdoske]

While these are advertised as 'new/never used' keep in mind that all gas mask actually do have a self life. Typically NATO gas mask can range from 5-20 years self life. So depending on when these were made and what the self life is your probably wouldn't want to trust your life with them from much longer.

Just thought I would throw that out there, btw it is a good price!