That's a great question, and it's something I think about a lot, especially since I've had my share of trash can mishaps. The short answer is: modern swinging lids on quality outdoor bins are generally quite secure, but their effectiveness depends on a few key factors.
First, let's talk about the lid itself. A good swinging lid is made from the same durable, often UV-resistant plastic as the bin body. It's designed to fit snugly, creating a seal that discourages pests. The hinge mechanism is crucial; sturdy, integrated hinges are much more secure and longer-lasting than cheap, attached ones that can snap.
The real security often comes from the latching system. Many bins feature a lid that locks into the handle or a separate latch. This is your best defense against clever raccoons and strong winds. Without a positive lock, a determined animal can absolutely pry it open. For high-wind areas or persistent wildlife, I highly recommend choosing a model with a built-in lock or adding a bungee cord.
So, are they 100% foolproof? No system is. A very strong animal or extreme weather could potentially compromise it. However, for everyday use—keeping out rain, containing odors, and deterring casual scavengers—a well-made bin with a locking swinging lid is a highly secure and convenient choice. My advice is to check the latch mechanism first when shopping; that's what makes the biggest difference in real-world security.