The NOMAD tumbler comes in multiple sizes, including an 8 oz, 12 oz, and 16 oz size—ideal for no matter how much coffee you like to drink. Shoppers can choose from either a flip lid or a grip lid.

Florian Pachaly and Fabian Eckert, the organization’s co-founders, started testing their idea for a deposit-based to-go coffee cup scheme in Rosenheim, near Munich, in 2016, with 12 partner ...