That's an excellent and very practical question! It shows you've definitely experienced the frustration of a trash bag catching on a rough edge or sharp corner inside a bin—a common, messy problem. The good news is, yes, there are absolutely urban trash cans designed specifically with smooth, rounded interiors to prevent bags from snagging.
While not every public bin on the street has this feature (many older models do not), it has become a key design priority for modern municipal and commercial waste solutions. Manufacturers have recognized this issue and now produce bins with seamless, rotational-molded plastic bodies or polished stainless steel interiors that have no welds, seams, or sharp angles where bags can catch.
You'll often find these user-friendly designs in settings like office buildings, airports, upscale parks, and modern urban developments. They prioritize both durability and ease of use for maintenance staff. The rounded corner design isn't just about preventing snags; it also makes the cans easier to clean and helps waste slide out more completely during emptying.
For your own use, many high-quality home and commercial indoor/outdoor bins also incorporate this principle. Look for descriptions like "seamless interior," "bag-lift design," or "snag-proof rim" when shopping. These features save time, reduce mess, and ultimately make the process of taking out the trash much smoother—exactly what a good urban design should do!