Pfandringe, Flaschensammler Etiquette, and the Cologne Design Student Who Invented the Ring Itself
A Pfandring is a metal ring or small holder fixed to the outside of a public trash bin, so a bottle collector, a Flaschensammler, can take an empty deposit bottle without reaching into the rubbish. Guides to this topic in Berlin, Munich, and Hamburg all mention that the ring was invented in Cologne, but none linger on what that actually meant here. In 2012, Cologne product design student Paul Ketz presented the ring at a competition organized by AWB Köln, the city's own waste management company, and won second place, then picked up the federal government's Bundespreis Ecodesign in its newcomer category the same year. Cologne's own city administration didn't rush to adopt it: a 2013 motion from SPD councilman Andreas Pöttgen to fund rings citywide was declined, so the Ehrenfeld SPD chapter raised private donations instead and put up ten rings, at roughly 220 euros each, from April 2014. Bamberg, not Cologne, ran the device's first official municipal pilot that same year. A smaller, separate push followed in 2018, when the Südstadt neighborhood blog meinesuedstadt.de mounted a single test ring at Chlodwigplatz and reported a positive local response. None of this ever became a citywide network: AWB Köln's own website today carries no dedicated Pfandring program. What actually helps day to day has little to do with finding a ring at all: leave the bottle upright beside the bin, cap screwed on, not crushed, and walk on rather than watching it get collected.
The Official Rule
There isn’t really an “official rule” for donating a bottle in Cologne, and that’s worth stating plainly before anything else. A Pfandring is a metal ring or small holder fixed to the outside of a public bin, letting an empty deposit bottle sit visibly on top instead of buried in the trash, so a bottle collector, a Flaschensammler, can take it without digging through garbage. SettledIn’s companion guide to Cologne’s Pfand deposit system covers how the 25-cent and 8/15-cent deposit amounts work. What it doesn’t cover, and what makes Cologne a genuinely different case from Berlin, Munich, or Hamburg, is that the ring itself, the physical object, was designed here.
Where the Ring Itself Was Actually Invented
Paul Ketz was a Cologne product design student in 2012 when he brought a simple idea to a competition organized by AWB Köln, the city’s own waste management authority: a ring that clips to the outside of a standard public bin, wide enough to hold a bottle upright and visible. He took second place, not first, and picked up the federal government’s Bundespreis Ecodesign in its newcomer category that same year. He has since described the ring as a bridge piece between the person setting a bottle down and the person who needs it, and the rings themselves are still hand-built at Jack in the Box e.V., a social employment workshop in Cologne, according to an interview Ketz gave to resorti.de.
What happened next in his own city didn’t follow a straight line from invention to adoption.
| Year | Where | What happened |
|---|---|---|
| 2012 | AWB Köln design competition | Paul Ketz presents the Pfandring, takes second place, wins the Bundespreis Ecodesign (newcomer category) the same year |
| 2013 | Cologne city council | SPD councilman Andreas Pöttgen proposes funding rings across the city; the administration declines |
| 2014 | Bamberg | Runs the device's first official municipal pilot, elsewhere in Germany, not in Cologne |
| April 12, 2014 | Köln-Ehrenfeld | The local SPD chapter raises private donations, installs ten rings at roughly 220 euros each |
| 2018 | Köln-Südstadt (Chlodwigplatz) | Neighborhood blog meinesuedstadt.de mounts a single test ring on a signpost, reports a positive local response |
The gap between the 2012 competition and the 2013 council vote is where the real story sits: Cologne’s own administration wasn’t convinced by the idea it had just judged. Political reaction split along familiar lines, with critics questioning the ring’s appearance on street furniture and others doubting whether a bin attachment addressed the underlying reasons people collect bottles for income at all. So it fell to a district party chapter to actually pay for the first ten rings out of its own fundraising, roughly a year after the city said no.
Real Life: What This Actually Means on a Cologne Street
Knowing the invention story doesn’t change much about what a resident actually finds walking around the city today, and that’s worth being upfront about. There is no citywide Pfandring network to look for. Ehrenfeld’s ten rings and Chlodwigplatz’s single test both came from a district political chapter and a neighborhood blog respectively, not from AWB Köln itself, and neither ever grew into something the city maintains or lists publicly. The design lives on far more visibly elsewhere: Wikipedia’s own account puts the number of German municipalities using some version of the ring at roughly 110 by October 2021, a spread that happened almost entirely outside the city where the idea started.
What that leaves for someone in Cologne today is less about hardware and more about habit, which is arguably the more useful takeaway anyway. A collector working a street in Ehrenfeld or the Südstadt doesn’t need an official ring to benefit from a bottle left out cleanly rather than buried in a bin, and the courtesy behind Ketz’s original design, making the handoff easier and less demeaning for the person doing the collecting, works with or without the physical object.
Step by Step
- Don't go looking for a citywide Pfandring network in Cologne. AWB Köln's own website lists no dedicated program, and the rings that have existed here came from a district party chapter and a neighborhood blog, not a maintained city system.
- Set the bottle upright, beside or on top of the bin, not inside it. This is the entire idea Ketz built the ring around, and it works at any bin regardless of whether a ring is actually attached.
- Leave the cap screwed on and don't crush the bottle. Both make it easier for a collector to carry and later redeem the bottle without a machine rejecting it.
- Tip out any leftover liquid rather than scrubbing the bottle clean. A quick tip is enough; a full rinse isn't necessary.
- Be quiet about it. Walk on rather than watching the bottle get collected, and don't insist on a direct hand-off unless a collector clearly welcomes it.
- For redeeming your own bottles rather than donating them, SettledIn's Cologne Pfand deposit system guide covers where Einweg and Mehrweg containers actually get accepted.
Compliance Note
This page describes an informal donation etiquette and a set of small-scale historical and district-level efforts in Cologne, current as of mid-2026, not a citywide program or legal requirement. The current physical status of Ehrenfeld’s 2014 rings and the 2018 Chlodwigplatz test ring could not be independently confirmed at the time of writing; check with AWB Köln directly for anything current.
FAQ & Common Pitfalls
Was the Pfandring itself actually invented in Cologne?
Yes, and it's a different claim from the one Berlin's guide makes about the 'Pfand gehört daneben' donation movement starting on its streets. The physical device, the ring or holder attached to a bin, came out of Cologne specifically. In 2012, Paul Ketz, then a Cologne product design student, presented the Pfandring at a competition organized by AWB Köln, the city's own waste management company, and took second place there, according to the German Wikipedia entry on the device. The same year, he won the federal government's Bundespreis Ecodesign in its newcomer category. Ketz has described the ring as a bridge piece between the person leaving a bottle and the person collecting it, a small object meant to make that exchange easier for both sides.
Does Cologne have an official citywide Pfandring network today?
No, and that's the part of the story that tends to surprise people once they learn the ring was invented here. A 2013 motion from SPD councilman Andreas Pöttgen asking the city to fund rings across Cologne was declined by the administration, according to Telepolis's reporting on the episode. The Ehrenfeld SPD chapter raised private donations instead and installed ten rings, at roughly 220 euros each, starting April 12, 2014. A separate, smaller test followed in 2018, when the Südstadt neighborhood blog meinesuedstadt.de mounted a single ring at Chlodwigplatz. Neither effort scaled into a citywide program, and AWB Köln's own website today carries no dedicated Pfandring page. Meanwhile, the device Cologne invented and largely didn't adopt itself had reached roughly 110 municipalities elsewhere in Germany by October 2021, per Wikipedia's account.
Are the Ehrenfeld or Chlodwigplatz rings still there?
It's honest to say this can't be confirmed rather than send anyone looking for them. Both were small, specific installations, ten rings funded by a district political party chapter in 2014, one test ring mounted by a neighborhood blog in 2018, not a maintained citywide system with a public inventory. Similar Pfandring installations in other German cities, covered in SettledIn's guides to Berlin, Munich, and Hamburg, tend to have a limited real-world lifespan once the group that put them up moves on to other projects. If a specific, current ring location matters to you, AWB Köln's own customer service line is the most reliable way to check, since the company's website carries no public list.
What's the actual etiquette, cap on or off, and does the bottle need rinsing?
Keep the cap screwed on rather than loose or removed. A loose cap on a single-use bottle makes it harder for a collector to carry without spilling, and it can cause a Rückgabeautomat to reject the bottle outright once they try to redeem it, the same reasoning behind the general German habit, confirmed by t-online's consumer reporting, of returning bottles with their caps left on. You don't need to scrub the bottle out, just tip out whatever's left so it doesn't drip. Beyond that, set it upright rather than on its side, so it can't roll or spill, and avoid crushing single-use plastic bottles, since a crushed bottle can fail the shape scan at a reverse vending machine even after someone goes to redeem it.