Figuring out the correct liner size for your outdoor trash can is simpler than you might think. First, the most reliable method is to check your trash can itself. Many models have the recommended liner size or gallon capacity printed on a label inside the bin or on the bottom. If that information isn't available, grab a measuring tape. Measure the height (from the bottom interior to just below the rim), the circumference (or width and length for rectangular cans), and the depth. Use these dimensions when shopping online or in-store—most liner packaging lists the dimensions they fit.
Another great tip is to know your can's gallon capacity, which is often stamped on it. A 32-gallon can needs a 32-gallon bag or slightly larger. If you're ordering a replacement, having your trash can's brand and model number is the surest way to find a perfect match. Remember, a liner that's slightly too big is better than one that's too small; it allows you to fold the excess over the rim for a secure fit that keeps pests out and protects your can from stains.