Can Liner Sizing Guide: How to Choose the Right Trash Bag
The wrong trash liner either slips into the can (wasting the whole bag) or blows out under load. Getting the size and thickness right is one of the easiest ways to cut waste and cost. Here's how to size can liners for your bins.
Match the liner to the can
A liner should overhang the rim by a few inches without pooling excess at the bottom. To size it: measure the can's circumference (for the liner's flat width) and its height plus a few inches for overhang. Round bins use a different fit than rectangular ones — check the recommended gallon range on the product.
Choose the right thickness
- High-density (HDPE) — thin, measured in microns. Best for light, dry waste like paper and restroom trash. Uses less material and costs less.
- Low-density (LLDPE) — stretchy, measured in mils. Best for heavy, wet or sharp waste (kitchens, warehouses, construction) because it resists punctures and tears.
Common gallon ranges
Small restroom and office bins are typically 7–15 gallon; medium office/breakroom cans 20–30 gallon; large containers and outdoor bins 33–60 gallon. Buying the correct size for each bin avoids paying for oversized liners on small cans.
Browse can liners and trash bags in every gallon size and mil, or stock the full facility with commercial cleaning supplies. Not sure which mil you need? Ask us for a quote and we'll match liners to your bins.
FAQ
How do I know what size trash bag to buy?
Measure the can's circumference (for liner width) and its height plus a few inches for overhang, then match to the product's recommended gallon range. The liner should overhang the rim without pooling at the bottom.
What's the difference between high-density and low-density liners?
High-density (HDPE) liners are thin and best for light, dry waste; low-density (LLDPE) liners stretch and resist punctures, making them best for heavy, wet or sharp trash.
What thickness of trash bag do I need?
Light restroom/office waste needs thin high-density liners; heavy or sharp waste needs thicker low-density (mil-rated) liners. Matching thickness to the job avoids both blowouts and overspending.