That's an excellent question that many people managing public spaces or commercial areas eventually ask. The short answer is: it depends entirely on your specific trash cans.
While you can certainly purchase standard trash bags from many suppliers, urban trash cans often have unique dimensions and durability requirements that standard kitchen bags can't meet. Using ill-fitting liners leads to tearing, slippage, and messy overflow.
First, identify your bin's specifications. Measure the height, width, and depth. Note the style—is it a round opening, rectangular, or a specialized design? This will determine if you need a specific "custom" liner or if a standard commercial size will suffice.
For heavy public use, you'll need thicker, more durable liners than typical household bags. These are often called "commercial grade" or "contractor bags." Many suppliers stock these, but for uniquely shaped municipal bins, you might need to contact the original manufacturer or a company that specializes in custom liners.
When sourcing, prioritize suppliers who understand public space requirements. The right liner should fit snugly, resist punctures, and make maintenance efficient. While specific liners might cost slightly more, they prevent the greater expense and hassle of frequent clean-ups.
In summary, start by measuring your bins and assessing their usage. For standard sizes, numerous suppliers will work. For custom designs, you'll likely need a specialized provider to ensure proper fit and function.