After some careful, initial investigation I'm considering the 3M 8233, N100 masks. I still need a way to prevent them from being crushed when not in use. If a designated protector does not exist, I need an exact size container that would not only prevent a tight squeeze but will also minimize used space.

http://survivalsolution.shopcheckout.com/avian-respirator-n100-p-193.html

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday