That's a great and very practical question! Dealing with raccoons, stray cats, or even dogs getting into the trash is a common headache. From experience and research, the depth of the bin itself is less critical than its overall security design. However, a good rule of thumb is to use a bin that is at least 30 to 36 inches (about 75 to 90 cm) deep or tall. This makes it harder for an animal to reach over the top or easily tip it over.
The real key isn't just depth, but combining it with other features. You need a bin with a tight-fitting, locking lid—preferably one with latches that raccoons' clever paws can't easily pry open. Materials matter too; a sturdy, heavy-duty plastic or metal bin is less likely to be chewed through or broken. Weight is a factor; a heavier bin is harder to knock over. Some people even add bungee cords for extra security.
Placement is also part of the solution. Keep your bins in a garage, shed, or a secured enclosure if possible. If they must be out in the open, try to place them on a flat, stable surface away from fences or objects that animals can climb. For persistent problems, consider investing in certified "bear-proof" or "raccoon-proof" bins, which are engineered with complex locking mechanisms. Ultimately, it's about creating a system that's more frustrating and difficult for the animal than it's worth, encouraging them to move on to an easier target.