That's an excellent question that gets to the heart of urban planning and public space management. While there isn't a single "one-size-fits-all" model that every city uses, a few designs have become incredibly popular worldwide due to their durability, capacity, and functionality.
The most common and versatile model you'll see in many downtown areas, parks, and pedestrian zones is the 120-liter (approximately 32-gallon) dome-lid bin. This model is popular for several key reasons. Its dome-shaped lid helps prevent rainwater from accumulating inside, which reduces weight, minimizes odors, and prevents liquid overflow. The pedal-operated mechanism allows for hands-free use, promoting better hygiene. Made from coated steel or durable plastic, these bins are resistant to rust, graffiti, and general wear-and-tear. Their size is a perfect balance—large enough to handle high-traffic area waste but not so large that they become an eyesore or are too heavy for a two-person crew to empty quickly.
For larger volumes of waste, such as at public events, in marketplaces, or near food courts, 1100-liter wheeled dumpsters are the workhorses of municipal waste collection. These large, mobile containers are essential for high-capacity needs and are designed for easy lifting and emptying by specialized garbage trucks.
Ultimately, the "most popular" model is the one that best balances cost, durability, capacity, and resistance to vandalism for its specific location. The 120-liter pedal bin remains the gold standard for general public use, proving that smart, functional design is key to keeping our cities clean.