Most respirator, gas mask, or protective mask collectors have one of these GP5 gas masks in their collection (below)
But people can’t find a safe filter for it! The original Warsaw Pact filters like the GP5 filter (below) has asbestos contained.
The modern French CFF3 filter is compatible with this mask as it is a 40mm GOST thread. I will leave a link in the comment below to where I found this filter!
Me wearing the 100% safe gas mask filter with a GP5
If you want, buy an FP5 filter. But they’re harder to find as an Australian. So go to the website below and buy one for your Soviet gas masks!