Tasse mit was drin

Solution

Imagine a huge store in a shape of a coffee cup in the middle of the city and about 6 small coffee cups or more are also distributed.
the cups that you drink from can be returned at any of these stations. that way we prevent waste being produced. of course you have to pay a deposit of 1� / $ 1.

The drinking cups are being cleaned at the small cups (stations) and brought back by bicycle in the evening to the big cup (main store). that way enough cups are there for the next day. Once you deliver your used cups at the stations you'll get your deposit back and we are one step closer to save the world.