The most hygienic urban trash can design is not just one clever feature—it is a combination of several practical ones. If I were choosing a public trash can for a city, I would look for a hands-free design first, usually a sturdy foot pedal or a reliable sensor lid. People should not have to touch the same lid everyone else touches, especially in busy streets, parks, and transit areas. A self-closing lid matters too, because it keeps waste enclosed and reduces smells, flies, and rain getting in.
The body should be sealed fairly well but still easy for workers to open and empty. Smooth, non-porous surfaces are a big deal: powder-coated metal, stainless steel, or high-quality plastic with rounded corners and no deep crevices. That makes wiping and washing much faster. I would avoid rough textures, decorative holes, and hard-to-reach seams where dirt and liquid can collect. A removable inner bin or bag-retention system also helps, because collection staff can empty it quickly without touching the waste itself.
For outdoor use, pest resistance and rain protection are part of hygiene. The lid should overlap the opening, and the base should be stable enough that water does not pool inside. A simple, robust mechanism is often better than a very complex one, because public bins get heavy use and sometimes poor maintenance. The best hygienic design is the one that stays clean in real life—not just on a product drawing. So my answer is: hands-free opening, self-closing lid, smooth easy-clean surfaces, sealed waste containment, and fast, safe emptying for collection staff. That combination keeps the public healthier and the streets cleaner without making the bin difficult to use.