It works like this. You bring your own containers and have those weighed. Berlin-based supermarket Original Unverpackt labels your containers. You shop. When you get to the till, the weight of your containers is subtracted and you pay for the net weight of your groceries. The label is designed to survive a few washings so you can come back and skip the weighing process for a while. Founders Sara Wolf and Milena Glimbovski say there’s a rising demand for products and services that deal with sustainability and that people demand alternatives to the “lavish” handling of our resources.