That's a common and frustrating problem! Animals like raccoons, dogs, or even the wind can make a mess by pulling the bag right out. The good news is, there are several effective and usually inexpensive ways to lock it down. Here are the best methods, from simple to more secure.
The most popular and effective solution is using a bungee cord with hooks. Simply place your full bag in the can, pull the bag's drawstrings up, and then stretch a bungee cord across the top of the can, hooking it onto the handles or under the lip on opposite sides. This creates a tight grid that holds the bag in place. For rectangular cans, you might use two cords in a cross pattern.
If you don't have a bungee cord, try the weighted lid method. Before putting your bag in, place a heavy brick or a large rock in the bottom of the can (to keep it stable). After putting the bag in, place another brick or heavy object *on top of the tied-off bag* before closing the lid. The weight inside the lid makes it much harder for an animal to nudge it open and pull the bag.
For a permanent fix, consider installing locking clips or straps. You can purchase metal or heavy-duty plastic lid locks that latch the lid to the can body. Alternatively, use a sturdy strap with a buckle (like a luggage strap) around the circumference of the can, securing the lid down. This is one of the most raccoon-proof options.
A clever DIY hack is the binder clip method. Use large, heavy-duty binder clips to clamp the top edge of your plastic trash bag directly to the rim of the trash can in several spots. This physically attaches the bag to the can, so even if the lid comes off, the bag can't be easily pulled out.
Finally, prevention is key. Avoid putting extremely smelly food waste (like fish or meat scraps) directly in the outdoor bin. Freezing these items until trash day can reduce odors that attract animals. Also, try to put your cans out for pickup in the morning rather than the night before.
The bungee cord method is often the best balance of simplicity, cost, and effectiveness. Give it a try—it will save you a lot of cleanup headaches!