I always assumed that the weird little gap in the cup holder in my old car was just part of the molded plastic—until I saw someone post about it online.
After noticing it myself, however, I could hardly see anything else except that gap in nearly every car I rode in. That narrow space between two circular slots seemed like an odd “design choice” after all.
It turns out… it usually is intentional.
Most of us use cup holders daily without ever considering why they’re made the way they are. However, there are a multitude of very small, practical design choices present throughout car interiors that provide unspoken assistance for driving.
The gap between cup holders is another one of those subtle but brilliant design elements.
I spent years not knowing what that slot was for. I’d wedge a pack of gum in there. Sometimes a cell phone. Neither fit quite right. I assumed it was just wasted space—a quirk of manufacturing, a leftover mold seam, a design flaw.
Then I asked a friend who used to work in automotive design. He laughed and said, “You don’t know what that’s for? Almost no one does. It’s one of the best-hidden features in your car.”
He explained it to me. And suddenly, everything made sense.
Let me tell you what that gap is really for—and why it’s been hiding in plain sight for decades.
The Short Answer (What You Came For)
That weird gap between the cup holders is designed to hold the handle of a grocery bag or a purse strap.
Yes, really.
It’s not a design flaw. It’s not a manufacturing seam. It’s a deliberately engineered feature that allows you to hook a plastic or paper grocery bag through the cup holder, keeping it from tipping over while you drive.
The bag hangs between the two cups, suspended by its handles. The weight of the bag rests on the divider, not on the floor. Your groceries don’t spill. Your eggs don’t crack. Your milk doesn’t roll under the seat.
It’s genius. And almost no one knows about it.
The Longer Answer (How It Works)
Let me walk you through the design.
The problem: Grocery bags in cars are a disaster. They tip over. Items roll out. Produce gets bruised. Jars break. And you spend the drive reaching into the back seat, trying to stabilize a bag that has no business being in a moving vehicle.
The solution: Create a dedicated slot for bag handles. But where? The cup holder is already there. It’s the perfect location—centered, accessible, and within reach of the driver.
The design: Two cup holders side by side, with a narrow slot between them. The slot is open at the top and bottom. The sides of the slot are slightly curved or tapered.
How to use it: Take your grocery bag (paper or plastic). Thread the handles through the slot from front to back. Let the bag hang down between the cup holders. The handles rest on the divider, supporting the weight of the bag. The bag hangs freely, not touching the floor.
The result: Your groceries stay upright. Nothing rolls away. You can reach down and grab items without taking your eyes off the road.