That's actually a really insightful question, and you've hit on a concept that waste management professionals often consider. The short answer is yes, getting a waste bin with a smaller opening can be a very effective physical and psychological deterrent against people dumping oversized items.
The logic is straightforward. A standard, large-opening bin invites all sorts of disposal, intentional or not. When someone has a bulky cardboard box or an oversized bag, a wide opening makes it easy to just "toss it in." A smaller aperture, however, forces a moment of pause. It creates a physical barrier that communicates a clear rule: "This bin is for regular, small bagged trash only."
This design strategy is commonly seen in public spaces, offices, and especially near recycling stations. You might have noticed recycling bins for cans and bottles with circular openings just big enough for a single container. This isn't just for sorting; it actively discourages someone from throwing in a full trash bag. The inconvenience of the small opening prompts people to think, "This doesn't belong here," and ideally, to find the correct disposal stream for larger waste.
However, it's important to pair this design with clear communication. Signs indicating what *should* go in the bin (e.g., "General Waste - Bagged Trash Only") and, crucially, information on where large items *should* go (e.g., "For Bulky Items, Please Use Designated Area") are essential. Without proper signage, frustration can lead to littering around the bin.
So, while a bin with a smaller opening is a powerful tool to discourage large items and promote proper sorting, it works best as part of a complete system: thoughtful design, clear instructions, and accessible alternatives for oversized waste.