Here's the proposed reg again:
The limits would apply to cups and containers used for sugary drinks. The limits would
also apply to all self-service cups and containers, regardless of intended contents. Without such limitation,
a self-service cup exceeding the maximum size could be used for either non-sugary or sugary drinks. This
rule will not limit the amount of sweetener a customer may add to his or her own drink
So is using your own cup or container illegal? Would someone be fined for carrying a 20oz reusable (environmentally friendly!!) container.