Mr. Rantala, I work in Washington D.C., and would like to keep a small mask in my backpack and/or car, in the event of an attack. I realize it would be best buy buy a full on mask, but I had questions about two specific masks and their effectiveness. Air Aid Emergency Mask: http://safetycentral.com/airemmasfora.html [FONT=Arial, Helvetica, sans-serif] [/FONT]MSA Affinity Ultra N100: http://www.approvedgasmasks.com/msa-affinyUltra.htm I realize these will only provide minimal protection, but I'm just looking for something extremely compact to keep with me, along with iosat tablets and other necessary precautions, that will help me in the event of an attack, whether it be a bomb, dirty bomb, nuclear, biological, etc. Thoughts? Thanks in advance.