Züri-Sack

Still in a "fight" with the filthy neighbours who leave their trash bags outside our house, got me thinking about the trash bins we have in our kitchens. It is a perfect fit for a "Züri-Sack", but the problem is when it starts to get full. Since we pay for garbage bags in Switzerland it is a necessity to fill it up as much as you can. Obviously.

But when the bin starts to get full, and you take it out of the kitchen container, you realize it's actually only 3/4 full. Which means you end up with a trash bag on the floor for a few days until it's really filled up.

I admire the Swiss usually being practical, but what exactly did they think here?