That's a great question, and one that city planners and business owners consider carefully. While there's no single "one-size-fits-all" answer, the most popular and practical size for an outdoor trash can in a typical downtown area tends to be in the 30 to 50-gallon (approximately 110 to 190-liter) capacity range.
This size is a workhorse for several reasons. A 30-50 gallon can is large enough to handle the high foot traffic and constant use of a downtown sidewalk, plaza, or near a public transit stop without overflowing too quickly. It strikes a crucial balance between capacity and practicality—it's not so massive that it's an eyesore or impossible for maintenance crews to empty efficiently, yet it's substantial enough to reduce the frequency of collections, saving on labor costs.
You'll often see these medium-capacity cans placed at regular intervals along main streets. The specific choice within that range depends on the exact location. A quieter side street might use a 30-gallon bin, while the bench area outside a popular coffee shop might require a sturdy 50-gallon model. For very high-density spots like bus terminals or public parks, you might see even larger 60+ gallon containers or multiple units grouped together.
The design is just as important as the size. In downtown settings, these cans are almost always commercial-grade, made from heavy-duty materials like galvanized steel, coated metal, or durable plastic to withstand weather and vandalism. They typically feature a secure, hinged lid (often with a swinging door) to contain odors, discourage pests, and prevent litter from blowing out.
So, while you might see variations, the 30-50 gallon commercial trash can is the unofficial standard. It provides the optimal blend of sufficient capacity, space efficiency, and cost-effective maintenance that keeps busy urban areas clean and functional.