Trash Bag Mil Thickness Guide
Trash bag packaging speaks two incompatible thickness languages β mils on low-density bags, microns on high-density liners β and the number on the case means nothing until you know which film you're reading. This guide decodes both, maps the standard commercial sizes, and gives you the density-first selection rule that actually predicts failures. For instant sizing from your can's measurements, use the free liner size calculator.
The two films
Published Β· Last updated
Every commercial liner is one of two polyethylenes, and the choice matters more than any thickness number:
| LLDPE (low-density) | HDPE (high-density) | |
|---|---|---|
| Gauge unit | Mils (1/1000 inch) | Microns (1/1000 mm) |
| Typical range | 0.7β3.0 mil | 6β16 micron |
| Failure mode | Stretches, deforms, survives | Zippers from any puncture |
| Best for | Mixed, wet, sharp, heavy waste | Paper, packaging, office routes |
| Cost per liner | Higher | Roughly a third of LD equivalents |
| In this store | 1.5-mil 45 gal, 3-mil contractor | 8-micron 16 gal, 40β45 gal HD |
Mil decode (LLDPE)
| Gauge | Class | Duty |
|---|---|---|
| 0.7β0.9 mil | Economy LD | Light mixed waste, low-fill cans |
| 1.0β1.5 mil | Standard commercial | The janitorial workhorse β collection points, kitchens, general routes (Top Knot 1.5-mil) |
| 2.0 mil | Heavy duty | Dense mixed waste, light debris |
| 3.0 mil | Contractor | Demolition, lumber, glass, roofing (Tasker, Veska) |
Micron decode (HDPE)
| Gauge | Mil equivalent | Duty |
|---|---|---|
| 6 micron | ~0.24 mil | Deskside paper only |
| 8 micron | ~0.31 mil | Office routes, light packaging (Aluf 8-micron) |
| 12 micron | ~0.47 mil | Heavier office mix, breakroom dry waste |
| 16 micron | ~0.63 mil | The HD ceiling β beyond this, switch density instead |
The conversion (1 mil = 25.4 microns) is printed here exactly so you can stop using it: cross-density comparisons mislead. A 12-micron HD liner outperforms a 0.5-mil LD liner on load β until a pen, a shard, or a staple touches it.
Standard sizes and the sizing math
| Liner size | Sold as | Typical receptacle |
|---|---|---|
| 24 x 24 | 7β10 gallon | Deskside baskets (HD roll x1000) |
| 24 x 33 | 12β16 gallon | Office/restroom cans (Aluf x1000) |
| 30 x 37 | 20β30 gallon | Kitchen and utility cans |
| 33 x 39 | 31β33 gallon | Standard round outdoor cans |
| 40 x 46 | 40β45 gallon | 44-gal Brute-class (Top Knot x100, HD x250) |
| 36β38 x 56β58 | 55β60 gallon | Drum-size and contractor use (3-mil cases) |
| 43 x 48 | 56-gal glutton | Wide-mouth gluttons |
Worked example β the 44-gallon Brute. Diameter 24", height 31.5". Width needed: Ο Γ 24 Γ· 2 = 37.7". Length: 31.5 + 12 (bottom reach) + 4 (overhang) = 47.5". Next standard size up: 40 x 46 β tight on length, which is why crews who want more rim fold-over jump to 38x58 "55-gallon" liners on the same can. Both answers are correct; the calculator flags the trade.
Selection rule of thumb
1. Pick density from the waste stream (sharp/mixed β LLDPE; paper/packaging β HDPE). 2. Pick size from the can's math, not the gallon label. 3. Step gauge up only for weight, one class at a time. Facilities running this rule stock two or three SKUs total β like an HD deskside case plus a 1.5-mil collection-point case β with contractor bags staged for projects. Waste handling is also a gloves-on task (nitrile collection), and liquid failures during bag pulls call for absorbents and a posted wet floor sign.
Frequently asked questions
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Related reference
Related on this site: trash bag sizes for common cans: brute, slim jim, office & toter (chart), best trash can liners, custodial worker safety guide, jumbo roll vs standard toilet paper: which tissue program?, best commercial paper towels, and brute vs slim jim trash cans.
Why trust WC Safety
WC Safety is an independent, affiliate-supported review site. It is not a retailer: it holds no inventory, takes no orders, and earns only from qualifying purchases through clearly marked links β which never changes what a product is rated to do. Standards language is taken from the regulation text directly, and ratings are reported as the manufacturer publishes them. We run no laboratory and perform no testing of our own. Where published sources disagree, we say so and plan on the conservative figure rather than the flattering one.
Our methodology
Figures come from the regulation and the published specification, in that order. Derated numbers are calculated, not estimated. Nothing here is presented as a measured result, because we measure nothing.
Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.
Frequently Asked Questions
What is 9.5 mil to micron?
The conversion (1 mil = 25.4 microns) is printed here exactly so you can stop using it: cross-density comparisons mislead. A 12-micron HD liner outperforms a 0.5-mil LD liner on load β until a pen, a shard, or a staple touches it.
What is the two films?
Every commercial liner is one of two polyethylenes, and the choice matters more than any thickness number:
What is selection rule of thumb?
1. Pick density from the waste stream (sharp/mixed β LLDPE; paper/packaging β HDPE).
What is frequently asked questions?
WC Safety participates in the Amazon Associates Program; product links may earn us a commission at no cost to you.
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