That's a really thoughtful question! Yes, you absolutely can, and it's a clever strategy many people use for better waste management. A trash can with a smaller opening acts as a simple, physical reminder. When the opening is only big enough for typical daily scraps like food wrappers or coffee grounds, it naturally discourages you from trying to stuff in oversized packaging, boxes, or other bulky items that should be broken down or disposed of separately.
The main benefit is that it helps with sorting at the source. You're less likely to toss a pizza box into a kitchen bin with a tiny lid, prompting you to take it directly to your larger recycling or main garbage bin. This can reduce overflow, minimize odors from decomposing large items, and keep your primary kitchen bin cleaner for longer.
It's perfect for specific spots like a home office, bathroom, or as a secondary bin on your kitchen counter for food scraps. Just be mindful that it will need emptying more frequently, as its capacity is usually smaller. So, if your goal is to nudge household habits towards more mindful disposal, a bin with a smaller opening is a practical and effective tool.