Figuring out the right size trash bag liner for your specific urban trash can model is easier than you think. You don't need the model number, just a quick measurement. Here’s a simple, foolproof method.
First, grab a measuring tape. For a rectangular or square can, measure the length, width, and height of the inside of the can. For a round kitchen-style bin, measure the diameter (width across the top) and the height.
Next, look for trash bags labeled with gallons (like 13-gallon). This refers to volume. To match your can, a good rule is: your bag's listed gallon capacity should be slightly larger than your can's actual volume. This ensures it will fit over the rim and have room to tie.
If you can't find your can's specs, use this quick check:
1. The bag's width should be at least 1.5 times the perimeter (circumference) of your can's top.
2. The bag's length should be the height of your can, plus the depth you want to fold over the rim (usually 4-6 extra inches).
Most standard "kitchen size" bags fit 30-40 liter (8-13 gallon) cans. For larger "tall kitchen" or commercial-style urban bins, you'll likely need 30-55 gallon bags. When in doubt, buy a small box of a size you think might work and test one. A well-fitting liner won't slip in, won't overflow too easily, and makes taking out the trash hassle-free.