That's a very common and frustrating issue in cities! Dealing with birds and pests rummaging through trash is a real challenge. Based on experience and municipal studies, the most effective lid design is a fully sealed, locking lid.
Traditional flip lids or partially open designs are an open invitation. Crows, raccoons, and rodents are incredibly clever at prying them open. The solution lies in creating a physical barrier they cannot breach.
Look for trash cans with tight-sealing gaskets or rubber seals around the lid's rim. This creates an airtight closure that blocks scent escape, which is what attracts pests in the first place. Locking or latching mechanisms are crucial—whether it's a simple clip, a lockable hasp, or a pedal-operated lid that closes automatically. These prevent animals from nudging the lid ajar.
For areas with particularly persistent crows or seagulls, weighted lids (often integrated into the design of heavy-duty commercial bins) are excellent. The lid is too heavy for birds to lift. Another effective design is the round, top-opening "hopper" style with a small, centered opening. It's difficult for animals to access the contents.
In summary, prioritize sealed, locking lids over open designs. While no solution is 100% foolproof against the most determined raccoon, a well-sealed, locking bin will solve the vast majority of urban bird and pest problems, keeping your area cleaner and more hygienic.