Hi, in Indonesia, we have the one major supermarket here has been doing this for quite a long time. The last time I visited their store this month, they are still doing this and use no plastic bag at all. Maybe you can check here: https://regional.kompas.com/read/2016/02/09/17271431/Di.Superindo.Belanja.Tak.Pakai.Kantong.Plastik.Langsung.Dapat.Diskon
or see the pic here: https://asset.kompas.com/crops/oDhaEgmGhQhFf9dMgmp1wxAf-eM=/162x56:838x507/750x500/data/photo/2019/03/01/3898518400.jpg
You might email the management if you think you need their key findings.
Thank you for your feedback Anthony. It is really a great idea. We sure will provide some options on cups materials on store based on the need of the customers.
We found on our research at Starbucks, people sometimes bring their children to the stores on weekends and there are some requests for hot water and it is usually served with ceramic cups. Unfortunately, these cups, based on historical record at stores, broke down easily when they are given to families with children. Therefore, we should provide unbreakable reusable cups, and it is usually made of plastic. But, any other options are still open as long as it doesn't break when it hit the ground accidentally for this segment of customers who dine in the store. The risk of this breakable ceramic cups for families with children is not only the cost of the cups, but also the convenience of the overall customers who might be shock for a broken ceramics sound and its small broken particles that should be cleaned as soon as possible to ensure the safety of the customers (esp. the children).