That's an excellent question that many people wonder about when dealing with public trash bins! The short answer is: it depends on the specific trash cans in your area, but most urban bins aren't completely universal.
Many municipalities do use standardized bin sizes to simplify maintenance, but there's no single universal size across all cities or even within the same neighborhood. You'll typically encounter several common dimensions - usually ranging from 10-15 gallons for sidewalk bins and up to 30-55 gallons for larger public area containers.
The best approach is to measure your local bins before purchasing liners. Check the height, circumference, and depth. Many public works departments actually specify the exact liner size needed for their bins. If you're responsible for maintaining these bins, contacting your local sanitation department can provide the most accurate information.
Some liner manufacturers do offer "universal fit" options with elastic tops or adjustable features, but these might not work perfectly for every bin. When in doubt, bringing a sample of your current liner when shopping can help ensure you get the right replacement.
Remember that using properly sized liners isn't just about convenience - it helps prevent bags from tearing, reduces litter, and makes sanitation workers' jobs easier. So while you might get lucky with a universal option, taking the time to find the specific size needed will save you headaches in the long run!