That's an excellent and practical question! A good lock is the difference between a messy, scattered driveway and a clean, secure property. The "best" mechanism really depends on your specific threat—whether it's clever raccoons, persistent dogs, or even wind.
For ultimate security against determined wildlife like raccoons and bears, a heavy-duty strap lock with a buckle (often made from rubber or reinforced polyester) is the top choice. These wrap around the lid and bin body, creating tension that's very hard for animals to pry open. Brands like Simplehuman offer integrated systems for their cans.
Built-in locking lids are a fantastic, hassle-free solution for general use. Many premium outdoor cans feature a latch or lock mechanism that engages when the lid closes. It's convenient and effective against wind and casual animal nudging.
For a quick, low-cost fix, bungee cords or elastic ropes with hooks are surprisingly effective. Criss-cross them over the lid and hook them under the bin's rim. They provide strong downward pressure. Just ensure the hooks are sturdy.
If you're facing human tampering or need a formal lock, consider a padlock and hasp. You'll need to install a sturdy hasp on the lid and body of a metal or thick plastic bin. This is the most secure but least convenient option.
My final tip? Combine methods. Use a strap lock for primary security and a bungee cord for extra reinforcement on pickup day. Also, storing your can in a garage or shed when possible is the ultimate lock. Start by assessing your main nuisance, and you'll find the perfect balance of security and convenience.