Hmm, $50 sounds like a helluva good deal for an Israeli gas mask because it's a quality, well proven product. However, I don't see any real use for that DIY mask other than maybe educational value.
Also, when you look at the time and stuff needed to build that DIY gizmo, it's not even that much cheaper compared to $50 for a military or industrial gas mask (depending on your needs).
A good mask is worth it's money. But 50 dollars isn't going to buy you a good mask. Surplus masks are generally outdated/expired. Also the filter generally canisters are expired or are trainings cannisters. All of them makes them less or non protective at all. Expired reactive canisters can even be harmfull for the user.
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