I have no numbers but I suspect that's already happening. I saw several people carry these reusable cups for drinks around last year (it seemed almost like a fa

I have no numbers but I suspect that's already happening. I saw several people carry these reusable cups for drinks around last year (it seemed almost like a fad, but I hope it lasts): https://www.rakuten.com.tw/search/冰霸杯/ https://www.rakuten.com.tw/search/冰霸杯/ Buying a reusable straw seems like the obvious next step. Many shops also give a 3% or so discount to people who bring their own cup.