That's a great question! Figuring out the right size liner can be frustrating, but it's actually quite simple once you know what to measure. Here's a natural, step-by-step way to get it right.
First, grab a measuring tape. You'll need two key dimensions: the height and the gallon capacity of your can.
1. For Height: Measure from the very bottom of the can's *interior* straight up to the very top rim. Don't measure the outside. This tells you how long your bag needs to be.
2. For Width/Circumference: Measure the circumference around the top opening of the can. Alternatively, measure the diameter (straight across the top). This ensures the bag won't be too tight or too loose at the top.
3. Check the Gallon Size: Most outdoor cans have their gallon capacity (like 32 gal, 44 gal, 55 gal) stamped or labeled on the bottom or side. This is the most common way bags are sold.
Now, match your measurements to the bag specs. Liner boxes list their dimensions (like "24" x 33"") and the can sizes they fit (e.g., "Fits 30-35 gallon cans"). Your liner's height should be the can's interior height *plus* 3-5 extra inches. This "overhang" is crucial—it allows you to fold the bag over the rim to secure it and tie it closed.
A pro tip: If your can tapers (is narrower at the bottom), use the top dimensions as your primary guide. For a snug fit, choose a bag whose listed gallon match is slightly smaller than your can's actual gallon size; for easier fitting, go slightly larger.
When in doubt, write down your can's brand, model, and exact measurements. You can always check them against the manufacturer's website or ask a store associate. Taking two minutes to measure saves you from the hassle of bags that are too small or wasteful ones that are too large!