That's a great and practical question! The weight capacity for the lid of an urban or commercial trash can isn't a one-size-fits-all answer, as it varies significantly by model, material, and intended use. Generally, for standard heavy-duty plastic or metal public bins, the lid itself is designed to withstand the weight of typical use—like someone pressing it open with a hand or foot, or wind blowing debris onto it. You can expect a well-constructed lid to handle distributed weights of 25-50 pounds (11-23 kg) without deforming or breaking.
For truly heavy-duty or commercial-grade bins, often used in parks, city streets, or construction sites, the lids are reinforced and may support much more, sometimes over 100 pounds (45 kg), to endure harsh conditions or accidental impacts. It's always best to check the manufacturer's specifications for the exact model. They sometimes list a "static load" rating for the lid. If you need to place heavy objects on top regularly, consider a bin with a flat, reinforced lid or a different waste solution altogether. The key is matching the bin's capacity to its environment to ensure safety and longevity.