For most small cafes, I’d recommend a covered commercial trash bin in the 32–45 gallon range. That size tends to hit the sweet spot: it holds enough waste to get through a busy morning or lunch rush without overflowing, but it doesn’t take up so much sidewalk space that it becomes a nuisance for pedestrians. A 32-gallon bin can work well if your cafe has light foot traffic and staff can empty it frequently. If you’re in a busier location or your customers often grab drinks and food to go, a 45-gallon bin is usually more practical.
I would avoid going much larger unless your local waste service requires it. Oversized bins on a narrow sidewalk can block sightlines, reduce walking clearance, and attract extra trash from people passing by. They can also be harder to move and clean. On the other hand, a bin that’s too small will overflow quickly, look messy, and create more work for your staff.
Make sure the bin has a lid, a sturdy body, and a liner size that’s easy to source. Keep it weighted or secured if wind or theft is a concern, and leave a clear pedestrian path around it. Check your local sidewalk and waste rules before you buy, because clearance requirements and permitted bin sizes vary by city. In short, choose a covered 32–45 gallon bin, place it carefully, and plan to empty it often. That will usually serve a small cafe sidewalk better than a huge bin or a tiny decorative can.