That's a very common and smart concern! Smells from an outdoor bin can be a real nuisance, attracting pests and creating an unpleasant area. The best lid design is one that creates a tight seal. Look for bins advertised as "odor-blocking," "animal-proof," or with "locking lids." These typically have a rubber or silicone gasket around the rim. When you close the lid, it presses down to form an airtight seal, trapping odors inside. This is far more effective than a simple, loose-fitting dome lid.
For general household waste, a bin with a sturdy, hinged lid that seals shut is ideal. Some have a foot pedal for hands-free opening, which is convenient. If you compost food scraps, consider a dedicated bin with a charcoal filter in the lid. The filter allows airflow (necessary for composting) but neutralizes smells as air passes through.
Another excellent option for active households is a bin with a sliding or flip-top lid. These close automatically via gravity or a spring, ensuring the lid is never accidentally left open. For areas with persistent pests like raccoons, a locking lid with a latch is essential. Remember, no lid is perfect forever, so regular cleaning of the bin itself is crucial for long-term odor control. Ultimately, investing in a quality bin with a proper sealing lid makes a huge difference.