That's a great and very practical question! Figuring out the right bag size for an outdoor bin can be surprisingly tricky, but don't worry, it's much easier than it seems. Here’s a natural, step-by-step way to solve this common hassle.
First, the most reliable method is to simply measure your bin. Grab a tape measure. You'll need the height (from the inside bottom to the very top rim) and the width (the diameter across the top if it's round, or the length and width if it's rectangular). For the bag height, a good rule is to add the bin's depth plus half its width again. This gives you enough extra liner to fold over the rim securely. For example, a 30-inch tall bin might need a bag around 40-45 inches tall.
If you don't have a tape measure handy, check the bin itself. Many models have the gallon capacity (like 32 gal, 55 gal) stamped or molded on the bottom or side. Once you know the gallon size, you can match it to bag packaging, which is almost always labeled the same way (e.g., 30-35 gallon bags).
Another real-world tip? Look at the brand of your current bags. If they fit well, note the size on the box. If they don't, assess the issue: are they too tall and floppy, or too short and slipping in? This tells you if you need a shorter or taller bag for that same gallon capacity.
For standard bins, here’s a quick cheat sheet: Small patio bins often use 8-13 gallon bags. Standard curbside bins are typically 32-35 gallons. Large wheeled carts are commonly 64 or 96 gallons. When in doubt, buying a slightly larger bag is safer than one that's too small.
Finally, the true test: the bag should line the entire inside and have enough material at the top to cuff over the rim neatly, without excessive overhang that catches wind or looks messy. It might take one try to get it perfect, but once you know your size, you're set!