I think they're onto something.

Kat and I noticed that people here carry drinks in bags. For instance, if you get a coffee from 7-eleven, juice for breakfast, or a soda from a fast food place, they'll stick it in a bag so you can carry it around...weird, right? That is not a thing in the US. But, then if you think about it, it's hard to believe we don't do it in America. If you get McDonald's to go, then you have to carry your drink in one hand and your meal in the other. If your drink is also in a bag then you have so much more freedom!

Efficiency.