You can't call yourself a coffee snob unless you know the reason behind this. That wouldn't be justice to real coffee aficionados. Don't be shy, just accept the fact that you drink coffee all the day and still don't know the reason why do coffee bags have a hole in them?
Don't worry; I'm not here to bust your ass but to educate you with the little wisdom which I gained while my hair turned white after all these years.
So, let's start.
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Now you know the reason why coffee bags have a hole in them.
Source: Tech Insider