My controversial opinion that the GP-5 gas mask is useless for most preppers due to it being a 40mm GOST gas mask.
Soviet filters have long since expired and NATO filters won't make an air-tight seal with the gas mask.
Modern Russian filters are still made in 40mm GOST but can be expensive to import.
Due to the cheap prices of other NATO compatible masks, in my opinion, it would be a much better option to simply get a cheap 40mm NATO mask or an Industrial mask where the filters are much easier to find cheaply.
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7 авг 2017