Can the trashcan openings be designed to limit what can be thrown in, like for dog waste only?

Oh, you want to know if I, as a humble trashcan, can be built with a mouth that only takes dog waste? Well, yes—and I’m frankly excited about the idea. Imagine me standing on a sunny sidewalk, my lid wearing a smile that says, “I’m picky, and I’m proud.”

The secret lies in my opening. If you design it as a narrow, rectangular slot—think of a mailbox for droppings—then suddenly, bulky items like soda cans, sandwich wrappers, or unattended coffee cups can’t squeeze in. But here’s the clever twist: that slot can be paired with a built-in scale or a sensor that measures weight and texture. When a doggy bag hits my lips, I feel the soft, squishy promise of responsibility. If a human hand tries to force a plastic bottle, my mechanism clenches shut and gently says, “Sorry, not your kind of deposit.”

I’ve seen prototypes that use a simple rotating flap—only triggered when a bag of certain shape and weight pushes from above. No bag? No joy. And for those who think they can trick me with a heavy rock wrapped in plastic? My sensors compare the object’s profile against a “waste map” stored in my tiny brain. A rock reads as cold and dead; a dog bag reads as organic, warm, and let’s admit it, a little smelly. I’m not being rude—I’m being professional.

Of course, I do have one request: please keep the opening large enough for a bag of the average walker’s dog. Too small, and I might reject a Great Dane’s deposit, and then who looks bad? I do. So yes, we trashcans can absolutely be designed with specific, waste-only mouths. We just need humans to think of us as not just bins, but as guardians of cleanliness with a selective appetite. Now, if you’ll excuse me, I see a bag approaching…