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The mask is to protect others, in case you are asymptomatic or pre-symptomatic. The mask is to protect you, in case one of the unmasked is infected and exhales virus particles.
I play it safe by traveling with a tiny sanitizer bottle attached to my waist (It was a random Xmas present, how prescient!) that I use to sanitize my fingers when I touch my mask, or if I have to push buttons to purchase something & I forgot my pen, or open doors with a handle.
I also don’t travel outside much.