That's an excellent and practical question! For public outdoor bins, the "best" lock system isn't one-size-fits-all; it balances security, durability, ease of use, and cost. The primary goals are to deter vandalism, prevent animal scavenging, and control access for authorized waste collection.
For most standard public bins, a simple, robust padlock and hasp system is highly effective. Choose a weatherproof, stainless steel padlock—shackleless models are great as they prevent bolt-cutter attacks. This is a cost-effective and familiar solution for maintenance crews.
However, if animals like raccoons or birds are the main issue, integrated latching mechanisms work better. Look for bins with built-in, spring-loaded locks or cam-action latches that automatically engage when the lid closes. These are tamper-resistant for casual intruders and require no keys for staff, streamlining the emptying process.
For high-vandalism areas or bins containing sensitive waste, keyed-alike locks are a game-changer. They allow one key to open all bins in a zone, vastly improving efficiency for collection teams while maintaining security. For larger commercial containers, a heavy-duty cylinder lock embedded in the door is the standard.
Ultimately, the best system is: 1) Weather-resistant (stainless steel or coated), 2) Tamper-proof (minimizes exposed shackles), 3) Practical for your staff (consider key management), and 4) Appropriate for the primary threat (animals vs. humans). A consultation with a reputable commercial waste supplier can help match the specific lock type to your location's needs and budget.