Short answer: yes, usually a little, and sometimes a lot—but they’re not a cure-all. I’d say small-opening urban trash cans can reduce litter because they keep more waste inside the bin, make it harder for wind to lift out loose paper or wrappers, and discourage people from dumping large household bags into public cans. That last point matters more than many people realize. When a public bin has a huge opening, it often becomes a mini transfer station for apartment trash, which leads to overflow and mess. A smaller opening nudges people to use the can for everyday street waste: coffee cups, snack wrappers, receipts, bottles, and small food packaging.
But design has to be balanced. If the opening is too small or awkward, people may just leave trash on top of the bin or beside it. That creates the exact litter problem the design was supposed to solve. I’ve also seen small-opening bins fail when they aren’t emptied often enough; once they’re full, litter builds up around them no matter how clever the opening is. Placement matters too. A bin near a bus stop, food kiosk, or crosswalk will catch more waste than one hidden on a quiet corner.
So do they reduce litter? In my view, yes—especially when the opening is comfortable to use, the bin is emptied regularly, and there’s clear signage. Small openings are a useful litter prevention tool, but they work best as part of a wider street-cleaning and public trash can design strategy, not as a standalone fix.