What Size Trash Bag Do I Need? Gallon-by-Gallon Guide
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Picking the right trash bag size comes down to two things: the gallon capacity of your can or job, and how the bag fits. Too small and it won't stay on the rim. Too big and you're paying for plastic you don't use. This guide breaks down every common size so you order right the first time.
Quick size chart
| Container / Use | Bag Size You Need |
|---|---|
| Small office / bathroom can | 7–10 gallon |
| Kitchen / under-desk can | 13 gallon |
| Utility / step can | 20–30 gallon |
| Standard tall garbage can | 32–39 gallon |
| Large contractor / cleanup | 42–45 gallon |
| 55-gallon drum | 55–60 gallon |
| 55-gallon drum (full liner) | 60 gallon |
| Outdoor toter / dumpster area | 60–65 gallon |
| 95–96 gallon rolling toter | 95 gallon |
How to size a bag correctly
The gallon number tells you capacity, but the fit matters just as much. A bag needs enough width to open over the rim and enough height to fold over the edge without slipping. Two quick rules:
- Width: the flat bag width should be roughly half the circumference of your can's opening, so it opens fully around the rim.
- Height: you want 3–4 inches of extra length to fold over the lip and hold the bag in place.
If a bag constantly slips down into the can, it's too small in width. If there's a lot of loose plastic bunching at the bottom, it's oversized for the load.
Match the size to the job, not just the can
For contractors and facilities, the load often matters more than the container:
- Light waste (paper, packaging, food service): size to the can, standard mil is fine.
- Heavy waste (construction debris, wet waste, yard cleanup): size up slightly and step up in thickness — a 42–55 gallon bag in 3 mil or 4 mil holds heavy loads without stretching or tearing.
- Drum liners (55-gallon steel or poly drums): use a true 55–60 gallon liner so it lines the full drum and folds over the rim.
Don't forget thickness
Size gets the bag on the can. Thickness (mil) keeps it from ripping. A big bag in thin plastic still fails under a heavy load. If you're hauling anything heavy or sharp, pair the right gallon size with 3 mil or 4 mil. (See our guide on 3 mil vs 4 mil to pick the right thickness.)
We manufacture our own bags in every size from 7 to 95 gallon — no middleman, no reseller markup, true specs on every box. Not sure which size fits your can or job? Reach out and we'll match you to the right one.