Cupholders are designed for disposable cups from fast food e.g. coffee cups from Starbuck/McDonalds, soda from 7/11, plastic water bottles. A lot of reusable wa

Cupholders are designed for disposable cups from fast food e.g. coffee cups from Starbuck/McDonalds, soda from 7/11, plastic water bottles. A lot of reusable water bottles store much more liquid in shapes that are more symmetric or even bottom heavy to ensure greater stability. These disposable cups go straight from the restaurant, to the car, and to the trash.