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I have a proper 3m mask when I need it, the issue is having something pocketable for when there’s unexpected dust - like when some prick comes in to enthusiastically sweep all the dust into the air.
Something like this looks good as it’ll fit in a pocket, but also hopefully be a bit more effective than a disposable mask.
A half or full face with swappable filters is what you need. A 3M one is great now you can get the filters again.
Won't fit in the pocket though. No reusable mask will.