When it comes to securing outdoor trash bins in high-theft areas, the most reliable solution is a robust, integrated locking system. For maximum security, I'd recommend a heavy-duty, weatherproof padlock combined with a reinforced steel hasp. Look for locks made from hardened steel, as they resist cutting and picking far better than standard models. Brands like Abus or Master Lock offer outdoor-rated padlocks with shrouded shackles to deter bolt cutters.
Alternatively, consider bins with built-in locking mechanisms, such as those with key-operated latches or combination locks integrated into the lid. These are specifically designed for public spaces and deter casual tampering effectively. For communal bins, a simple but effective method is using a heavy-duty bike lock threaded through the bin's handles and anchor points.
Remember, the goal isn't just to slow down thieves but to make your bin a less appealing target than others. Always anchor the bin to a fixed object if possible, and opt for locks with corrosion-resistant coatings to withstand outdoor conditions. No lock is 100% theft-proof, but a high-quality, visible locking system significantly reduces your risk.