That's an excellent question about urban waste management. Yes, the openings on many modern urban trash cans can indeed be specifically sized or designed to help prevent people from stuffing in oversized items. This is a common consideration for city planners and public works departments.
Manufacturers often offer customization options for aperture sizes. A standard opening might be around 10-12 inches in diameter, which is sufficient for everyday litter like cups, wrappers, and bags, but deliberately too small for items like bulky bags of household garbage, cardboard boxes, or construction debris. Some designs use slotted openings for flat items like newspapers, while circular openings deter larger, bulkier objects.
The primary goal is to maintain the can's purpose for pedestrian litter and reduce contamination from improper disposal, which can lead to overflow, attract pests, and increase maintenance costs. It encourages residents and businesses to dispose of large items through proper bulk waste collection channels. While not a foolproof solution—as determined individuals might still try to force items—strategically sized openings are a simple, effective first line of defense in keeping public spaces cleaner and reducing operational burdens on municipal services.