Most contractor bags sold in the US are 3 mil, in a 42-gallon (33 x 48 in) or 55-gallon (38–39 x 58 in) size. Thinner bags around 2–2.5 mil are sold as “contractor” or “clean-up” bags too, and 4 mil and 6 mil are the heavy grades for demolition and sharp debris. But the number on the box is only part of the story. Resin blend, seal and the right size for the job decide whether a bag holds or splits on the way to the dumpster. Here is how to choose, and what to put in an RFQ if you are buying for your own brand.
What makes a bag a “contractor bag”?
A regular kitchen bag or janitorial can liner is made to line a can and hold mixed light waste. A contractor bag is made to be filled on the floor, dragged, lifted and thrown. It is thicker, usually made from linear low density polyethylene (LLDPE), and built to stretch around a sharp edge instead of tearing.
If you need the basics on mil, micron and HDPE vs LLDPE first, read our trash bag thickness guide and the mil vs micron conversion chart.
Common US sizes and thicknesses
We checked current listings from Uline, WebstaurantStore, Home Depot and hardware distributors. Compare by inches, not gallons.
| Label on the box | Flat size (W x L) | Thickness seen on the market | Example listings |
|---|---|---|---|
| 30–33 gal | 30 x 36 in, 33 x 39 in | 2.5 mil, 3 mil, 6 mil | Uline 30 gal; Lavex 33 gal 2.5 mil (WebstaurantStore) |
| 42 gal | 33 x 48 in | 2.5 mil, 3 mil (most common), 6 mil | Husky 42 gal 3 mil; Plasticplace 3 mil and 6 mil |
| 40–45 gal | 32 x 50 in, 40 x 46 in | 3 mil, 6 mil | Uline 40–45 gal; Lavex 45 gal 3 mil |
| 55–60 gal | 36 x 58, 38 x 58, 39 x 58 in | 3 mil, 4 mil, 6 mil | Uline 55–60 gal 39 x 58; Ultrasac 55 gal 38 x 58 |
| 95 gal | 56 x 64 in | 3 mil, 6 mil | Uline 95 gal |
“42 gallon” almost always means 33 x 48 in, but “55 gallon” can be 36, 38 or 39 in wide. And the same 33 x 48 in bag is sold at 2.5, 3 and 6 mil, so gallons tell you nothing about strength.
2 mil vs 3 mil vs 6 mil: which one?
2–2.5 mil
Good for leaves, grass, packaging and general cleanup. It will not survive broken drywall corners, nails or roofing shingles for long, especially when dragged.
3 mil
The workhorse. Interplas, a US bag supplier, calls 3 mil “the standard thickness for contractor garbage bags”, and that matches what we see on shelves. It handles mixed renovation debris, drywall and wet yard waste if you don’t overfill it.
4–6 mil
For demolition, roofing, broken concrete, glass and anything with points. Uline sells its 6 mil range as “Extra Heavy”. The trade-off: a 6 mil bag uses about twice the resin of the same 3 mil bag, and a full one can be too heavy to lift. Often a smaller 3 mil bag is the better fix.
Mil is not everything: resin matters
Two bags at 3 mil can perform very differently. What changes the result:
- LLDPE vs HDPE. Almost all contractor bags are LLDPE or LLDPE blends, because LLDPE stretches and resists puncture. HDPE is stiff and strong in tension but splits once punctured, so it suits office liners, not debris.
- Resin grade. Higher-performance LLDPE grades (octene, metallocene) give more tear and puncture strength at the same gauge than a basic butene grade.
- Recycled content. Recycled resin lowers cost and helps with recycled-content targets, but it varies more from lot to lot and usually needs extra thickness to match a virgin bag. Our virgin vs recycled comparison covers the details.
- The seal. A weak bottom seal fails before the film does. Ask how the seal is tested, not just the gauge.
Flat or gusseted, flap tie or drawstring
Most contractor bags are flat bags with a flat or star seal bottom. Gusseted bags open square, which suits square bins and carts, but they cost more and are less common here.
For closure, the usual retail choices are an open top (tie it yourself), flap tie (two cut flaps you knot together, sold by Plasticplace and as “Grip ‘n Tie” on Sturdi Extra bags), or a twist tie in the box. Drawstrings are easy to close and carry, but on a heavy, sharp load the drawstring hem can become the weak point. For yard waste and lighter cleanup a drawstring is a real selling point. For demolition, flap tie or plain top is safer.
Black or clear?
Black hides the contents. Clear lets haulers and inspectors see inside, and some cities require it. Hampton, Virginia, for example, requires all yard waste to go out in clear bags so collectors can check for trash. Others go the other way: Syracuse, New York says not to bag construction debris at all and to use boxes or buckets instead. Rules change by city, so check before you print “approved for curbside” on a box.
How retail packs are labelled
US contractor bag boxes usually show gallons, inch size, mil, count and closure. Some show a strength claim instead of, or next to, the mil, such as “equivalent to” a thicker bag or a pounds-it-holds figure. Comparison claims between bag brands have been challenged before the National Advertising Division, which has asked advertisers to say clearly what they are comparing against. Print the real gauge, and keep any “equivalent” claim to what your own test data supports.
Sizing a bag to a can or drum
For a flat bag on a round container:
- Width = half the container’s circumference, plus 2–3 in so it slides on easily.
- Length = container height + half the diameter (to cover the bottom) + 3–4 in overhang.
That is the minimum. Contractor bags are usually cut longer so there is film left to knot a full bag. If the bag is filled on the floor, size it to what your crew can safely lift.
What to send a supplier in an RFQ
- Flat width x length in inches, and gusset if any
- Thickness in mil, and whether it is a minimum or nominal value
- Resin: LLDPE grade, virgin or recycled, and any recycled-content target
- Colour (black, clear, Pantone shade) and print, if any
- Seal type and closure: open top, flap tie, drawstring
- Packing: roll or folded, count per box, your retail box design, barcode and shipping marks
- Use and any test you need (dart drop, tear, load)
How we can help
We make contractor bags to your size, thickness and colour. Send us your spec or a sample. Recycled content is available on request. We also make drawstring trash bags on standard and interleaved rolls, heavy-duty trash can liners and C-fold trash bags. We print up to 8 colours by gravure, match film colour to Pantone, and pack in your own retail box with your barcode labels and shipping marks. Every item carries a tracing number for quality control. We work to ISO 9001 and JIS. Lead time is 4–6 weeks for a first order and 3–4 weeks for a repeat, and free samples are available.
Frequently asked questions
What is the standard size of a contractor bag?
The most common is the 42-gallon bag at 33 x 48 in. The 55-gallon size is the next most common, at 36 to 39 x 58 in depending on the brand.
Is a 3 mil contractor bag strong enough?
For most renovation and cleanup debris, yes. 3 mil is the standard grade. Move to 4–6 mil for demolition, roofing and sharp material, or use a smaller bag so it is not overloaded.
What is the difference between a contractor bag and a heavy-duty trash bag?
There is no legal definition. In practice, contractor bags are 2.5–6 mil LLDPE bags built for debris, while “heavy-duty” trash bags and can liners are often thinner and made to line a can.
Why are some 2 mil bags sold as strong as 3 mil bags?
Better LLDPE grades can give more puncture and tear strength at a lower gauge. Ask the supplier for test data on the actual bag, not a gauge comparison.
Ready to quote your own contractor bag line? Send us your spec or WhatsApp +84 898 545 893.
Sources: Uline Contractor’s Bags; Interplas contractor bags; Husky 42 gal contractor bags, Home Depot; Plasticplace 42 gal 6 mil, Home Depot; Ultrasac 55 gal 38 x 58, Home Depot; Lavex 45 gal 3 mil, WebstaurantStore; Sturdi Extra contractor bags; City of Hampton, VA yard waste FAQ; City of Syracuse yard waste and debris; BBB National Programs NAD decision on trash bag strength claims.