That's an excellent question for anyone managing public spaces! From my experience, the most durable option for a high-traffic city sidewalk is a heavy-duty, commercially-rated bin made from galvanized steel or powder-coated steel. These materials resist rust, weathering, and the daily wear-and-tear far better than plastic or thin-gauge metal.
Look for bins with a minimum 10-gauge steel thickness. Key features that boost durability include a sturdy, tamper-proof lid (often dome-shaped to discourage dumping of home trash), welded seams instead of bolts that can loosen, and a secure, hidden anchoring system. A good internal liner bag system also protects the inner shell. Brands like Glasdon, United Receptacle, or Toter commercial lines are industry standards. While the upfront cost is higher, their 10-15 year lifespan with minimal maintenance makes them the most cost-effective and durable choice for a demanding sidewalk environment. Avoid bins with complex hinges or plastic components exposed to direct sun, as these fail first.