I agree with you. 

I don't buy it often because I don't want to spend money on tumblers or eco-bags, but there are quite a few things I get from somewhere. 

I think our country goes on for a long time once it's really popular. (One at a time is enough...!)

I know more about the fact that using tumblers may directly affect my health. We'd better not use the tumbler we already have until it's completely safe.