Comment by rnk

And no coffee shop these days wants to use your cup because they're worried about whether it's clean and they don't want to touch any of their coffee making tools to your cup accidentally and contaminate them. Would it be hygienically safe and environmentally good to have the coffee shop make things in a ceramic cup and let you use that ceramic cup, and if you're leaving, you can pour from that ceramic cup to your ceramic cup. That seems like a big pain though. Doesn't work for drive-thru.