# Garbage & Bin Bags

A bin liner's job, duty class and resin decide everything else: a kitchen bag optimizes for scent and drawstring fit, a contractor bag for mil and puncture resistance, a compost bag for a certified-compostable resin, and a yard-waste bag for whether the municipality even allows plastic.

## How it works

A bin bag is blown polyethylene film sealed into a pouch: a star seal (one spot, no gussets) conforms to any can and resists leaks best; a flat seal is a plain pillow-case seam that leaks more under heavy loads; a gusset seal tucks in the sides to expand but leaks at the fold. Two resins dominate: LLDPE stretches around a puncture instead of tearing, so it takes sharp or heavy waste; HDPE is thinner and cheaper but splits once punctured, so it suits light, non-sharp waste. Thickness is quoted in mils (LLDPE/LDPE) or microns (HDPE, 1 mil = 25.4 microns), rising with duty class from under 1 mil to 3+ mil for contractor debris. Compostable bags swap in a bio-based resin certified to ASTM D6400; yard-waste bags swap to kraft paper where plastic is banned curbside.

## How an expert narrows the choice

```mermaid
timeline
  section 1 · Primary use
    kitchen_wastebasket : ask Closure, Scent : skip Rodent/pest deterrent
    outdoor_yard_lawn_leaf : ask Material : skip Scent, Odor control technology
    contractor_heavy_debris : ask Thickness (duty class), Material : skip Scent, Odor control technology, Compostable certification
    compost_food_scraps : ask Compostable certification : skip Reinforced/flex film, Rodent/pest deterrent
  section 2 · Capacity
    What size can or bin is it going into?
```

1. **Primary use.** Kitchen trash, outdoor/yard waste, contractor debris, or compost?
   Each use points at a different resin, thickness and certification: kitchen wants scent and fit, contractor wants mil and puncture resistance, compost wants a certified resin, yard waste may need paper instead of plastic.
   If kitchen_wastebasket: ask Closure, Scent; skip Rodent/pest deterrent.
   If outdoor_yard_lawn_leaf: ask Material; skip Scent, Odor control technology.
   If contractor_heavy_debris: ask Thickness (duty class), Material; skip Scent, Odor control technology, Compostable certification.
   If compost_food_scraps: ask Compostable certification; skip Reinforced/flex film, Rodent/pest deterrent.
   Skip if already known: a query that already names kitchen, lawn/leaf, contractor, or compost/food-scrap bags, an earlier answer naming a bin location or waste type.

2. **Capacity.** What size can or bin is it going into?
   Gallon capacity sets the width and length a bag needs; a bag sized for the wrong can either overflows or bunches up and slips inside the rim.
   Skip if already known: an earlier answer naming a gallon or liter size, an earlier answer naming a specific can model (e.g. a 13-gallon kitchen can or a 32-gallon Brute).

## What to surface

### Primary use

What the bag is mainly used for: kitchen/wastebasket trash, outdoor and yard/leaf waste, contractor or heavy debris, or compostable food scraps. Use decides the whole spec sheet: a kitchen bag is judged on scent, drawstring fit and leak protection; a contractor bag on mil and puncture resistance; a compost bag on certification; a yard-waste bag on whether plastic is even allowed by the local program. [1] [6] [10]

Values: kitchen_wastebasket, outdoor_yard_lawn_leaf, contractor_heavy_debris, compost_food_scraps.
Question to ask: Kitchen trash, outdoor/yard waste, contractor debris, or compost?

Used as: top-level split, filter. Data: derived from listing fields, backfill cost low. Look for it as: Derive from the product title and category breadcrumb ('kitchen trash bags', 'lawn and leaf bags', 'contractor bags', 'compostable food scrap bags').
Title keyword match covers almost every listing; default ambiguous drawstring bags without a stated size class to kitchen_wastebasket.

### Capacity

The bag's rated volume in gallons, which maps to a standard flat width and length. A bag sized under the can overflows and falls in; sized too far over, it bunches at the bottom or leaves too little overhang to grip the rim. Experts size from the can's diameter and height, not the gallon label alone. [1] [6]

Range: 2.6 to 60 gallon.
Question to ask: What size can or bin is it going into?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Almost always the lead number in the title ('13 Gallon', '55-60 Gallon').
Title number extraction; cross-check against the flat width x length dimensions when both are present, since sellers round gallon claims generously.
Chart: position on a size scale from deskside bins to drum-size/contractor liners.

### Compostable certification

Whether the bag is not certified compostable, certified for industrial/municipal composting under ASTM D6400 (commonly shown as a BPI-certified mark), or additionally certified for home composting (shown as an OK compost HOME or similar mark). This is the governing standard for the category: a bag only counts as compostable if it is certified to ASTM D6400 (or the equivalent EN 13432), and industrial-only certification does not mean a bag will actually break down in a backyard compost pile, only in a facility that accepts it. [5] [6]

Values: not_compostable, industrial_compostable_astm_d6400_bpi, home_compostable_ok_compost_home.
Question to ask: Does it need to be certified compostable?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named directly in the title and on-pack when present ('BPI Certified', 'ASTM D6400', 'OK compost HOME'); default to not_compostable when absent.
Title/on-pack keyword match against the certification mark names; treat an unmarked 'biodegradable' claim as a separate, uncertified claim rather than this certification.

### Closure

How the full bag is closed: a drawstring built into the rim, a flap/tuck tie, a separate twist tie, a handle, or no closure at all. A drawstring closes and lifts the bag in one motion and some are built to stretch and grip the can's rim so the bag doesn't slide down while filling; a twist tie or flap needs a free hand and a knot, which matters most for anyone handling a full, heavy bag one-handed. [4] [7]

Values: drawstring, flap_tie, twist_tie, handle_tie, none.
Question to ask: Drawstring, tie flaps, or a separate twist tie?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the title ('Drawstring Trash Bags', 'Flap Tie', 'with Twist Ties').
Title keyword match; default contractor and lawn/leaf large bags to twist_tie or none when the title doesn't say drawstring.

### Reinforced/flex film

Whether the film is a standard single layer or a branded reinforced/stretch film marketed as extra tear- and puncture-resistant. Reinforced 'flex' films are marketed to stretch around a sharp or heavy item instead of tearing, which is the main differentiator brands sell above the base duty-class thickness. [7]

Values: standard_film, stretch_flex_reinforced.
Question to ask: Does it need extra tear/puncture resistance?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named in the product line ('ForceFlex', 'Flex Strength', 'Active Tear-Resistant Technology').
Match known reinforced-film product-line names; default to standard_film otherwise.

### Thickness (duty class)

The film's gauge, banded into the duty classes the trade uses: under 1 mil (light/economy), 1.0-1.5 mil (standard), 2.0 mil (heavy duty), or 3.0 mil and up (contractor). HDPE liners quote the equivalent in microns (1 mil = 25.4 microns) rather than mils. Thickness is the number buyers fixate on, but it only predicts load-bearing strength, not puncture resistance, which depends more on resin. Stepping up a duty class without checking resin can still buy a bag that tears on the first sharp edge. [1] [2]

Values: under_1_mil_light, 1_to_1_5_mil_standard, 2_mil_heavy_duty, 3_mil_plus_contractor.
Question to ask: Light office trash, everyday kitchen, or heavy debris?

Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Sometimes stated directly ('1.2 Mil', '3 Mil Contractor') but often replaced by marketing terms like 'Heavy Duty'; map those terms to a class rather than trusting them at face value.
Map explicit mil/micron numbers directly; map unlabeled duty-class marketing words (economy/standard/heavy-duty/contractor) to the matching class as a lower-confidence fallback.
Chart: position on a thickness scale by duty class.

### Material

What film or paper the bag is made from: HDPE, LLDPE, LDPE, a bio-based compostable resin, an oxo-biodegradable-treated plastic, a recycled-content blend, or kraft paper. Resin decides failure mode more than thickness does: LLDPE stretches around a puncture, HDPE splits once punctured but costs less per bag. Paper matters for yard waste because many municipalities will not collect plastic bags of leaves or grass at all, and a bio-based resin matters because ordinary plastic in a compost bin does not break down. [2] [1] [4] [10] [13]

Values: hdpe, lldpe, ldpe, bio_based_compostable_resin, oxo_biodegradable_additive, recycled_content_blend, paper_kraft, unspecified.
Question to ask: Plastic (which kind), paper, or compostable?

Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Rarely a stated field; HDPE/LLDPE almost never appear in the title. Paper vs plastic and 'compostable' do appear in the title; infer resin otherwise from duty class and brand line.
Default thin, crinkly office/recycling bags to HDPE and stretchy drawstring kitchen/contractor bags to LLDPE; treat as unspecified rather than guessing resin when the title gives no signal.
Chart: position on a puncture-resistance axis, LLDPE and paper-for-its-use-case highest, HDPE lowest.

### Color / opacity

The bag's color and how much it hides its contents: black, white, clear or translucent, or a program-specific color used for curbside sorting. Opaque black or white hides contents for household trash; clear or translucent is specified by some commercial and recycling programs precisely so haulers and inspectors can see what's inside without opening the bag. [1]

Values: black, white, clear_or_translucent, color_coded_program, tinted_other.
Question to ask: Does it need to hide what's inside, or stay see-through?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the title or swatch ('Black Trash Bags', 'Clear Recycling Bags').
Title/swatch keyword match.

### Scent

Whether the bag is unscented, lightly scented, or carries a strong branded fragrance. Scented bags mask kitchen odor but some households and anyone fragrance-sensitive specifically seek out unscented; it only matters for bags that will hold food waste, not for contractor, recycling or yard-waste bags. [7]

Values: unscented, lightly_scented, heavily_scented.
Question to ask: Scented or fragrance-free?

Used as: filter. Data: on the listing, backfill cost low. Look for it as: Almost always in the title ('Lavender', 'Fresh Clean', 'Unscented', 'Scent Free').
Title keyword match against a scent-name list; default to unscented when no scent name appears.

### Odor control technology

Whether the bag just relies on scent, or adds an odor-neutralizing or antimicrobial treatment such as a baking-soda-based neutralizer or an antimicrobial additive. Scent alone covers odor; a neutralizer (branded baking-soda or antimicrobial additives) is marketed to actually reduce the odor-causing bacteria rather than mask them, which matters more for bags left to fill over several days. [7]

Values: none, baking_soda_odor_neutralizer, antimicrobial_treatment.
Question to ask: Just scented, or does it actively neutralize odor?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named on-pack and in the title ('Odor Control', 'Arm & Hammer').
Title/brand keyword match against known odor-control brand names; default to none when absent.

### Recycled content

Whether the bag's plastic discloses no recycled content, a partial blend of post-consumer and manufacturing scrap resin, or a majority recycled-content formulation. Brands differ sharply here: mainstream lines blend in some post-consumer resin alongside reclaimed manufacturing scrap under one combined figure, while a few specialty eco lines build the bag from mostly post-consumer plastic. Buyers who care about this want the tier, since the underlying disclosed figures and what counts as 'recycled' vary by brand. [8] [9]

Values: none_stated, partial_recycled_blend, majority_recycled_content.
Question to ask: Recycled-content plastic, or no preference?

Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Stated on-pack and sometimes in the title for lines that have it ('Recovered Materials', 'Recycled'); absence usually means none_stated rather than zero.
Keyword/brand-line match against known recycled-content SKUs; default to none_stated when the listing says nothing.
Chart: position on a recycled-content scale, none to majority.

### Rodent/pest deterrent

Whether the bag is untreated, or treated with a scent-based repellent marketed to deter rodents and other pests from chewing through it. This matters specifically for outdoor and curbside bins left out overnight, where rodents chewing through a bag is the actual failure mode no mil rating addresses; it is a scent treatment, not a thickness or material change. [11]

Values: none, scent_based_repellent_treated.
Question to ask: Left outside where rodents could get at it?

Used as: filter. Data: on the listing, backfill cost low. Look for it as: Named in the title for the lines that have it ('Rodent Repellent', brand name 'Mint-X').
Title/brand keyword match; default to none otherwise.

### Bottom seal

How the bag's bottom is closed: a star (X) seal sealed in one spot with no gussets, a flat seal sealed straight across like a pillowcase, or a gusset seal with the sides tucked into folds. Star seal is the most leak-resistant and conforms to any can shape, which is why it dominates heavy-duty and commercial lines. Flat seal is simplest but fits cans poorly and leaks more under heavy or pointed loads; gusset seal expands to the bin's shape but the fold itself is a weak point for liquids. [2] [3]

Values: star_seal, flat_seal, gusset_seal.
Question to ask: Does it need to hold wet or heavy trash without leaking?

Used as: filter, shown on the card. Data: needs research, backfill cost high. Look for it as: Rarely named directly in a title; sometimes shown in a product photo of the bag's bottom. Most high-density (HDPE) lines default to star seal.
Needs a product photo or spec sheet read; default heavy-duty/commercial HDPE lines to star_seal and basic economy LDPE lines to flat_seal when no photo is available, flagged low confidence.
Chart: position on a leak-resistance axis, star seal highest.

### End-of-life recyclability

Whether the bag material itself (not its box) can be recycled: not recyclable, or accepted only via a store drop-off film-recycling program. A recyclable box does not mean the bag is recyclable too; plastic film like trash bags is excluded from standard curbside recycling and, even where accepted, needs a separate store drop-off program rather than the household bin. [7] [12]

Values: bag_not_recyclable, bag_film_recyclable_dropoff_only.
Question to ask: Is the bag itself recyclable, not just its box?

Used as: shown on the card. Data: needs research, backfill cost high. Look for it as: Rarely in the title; stated on brand spec sheets, usually separately from the box's own recyclability claim.
Default ordinary polyethylene trash bags to bag_not_recyclable absent a stated film drop-off program; never infer recyclable from a 'recyclable box' claim alone.

## Numbers worth computing

| Metric | Formula | Why |
|---|---|---|
| Mil-equivalent thickness (mil) | `lookup thickness_gauge_class band midpoint in mils: under_1_mil_light=0.8, 1_to_1_5_mil_standard=1.25, 2_mil_heavy_duty=2.0, 3_mil_plus_contractor=3.0 (open floor)` | thickness_gauge_class already bands HDPE's micron reading and LLDPE/LDPE's mil reading onto one mil-named scale; converting each band to its mil midpoint gives one sortable number instead of four labels.  |

## What you give up

- HDPE liners are thinner and cheaper per bag and carry heavy loads well, but once punctured they tend to split or 'zipper' open rather than stretch; LLDPE costs more per bag but stretches around a sharp edge instead of tearing. [1] [2] Board branch: "Cheaper and load-bearing, vs. puncture- and tear-resistant".

## Words you will meet

- **Mil**. One-thousandth of an inch; the unit used for LLDPE and LDPE bag thickness.
- **Micron**. One-thousandth of a millimeter; the unit used for HDPE bag thickness, equal to about 1/25.4 of a mil.
- **Resin**. The raw plastic a bag is blown from; the three conventional ones are low-density, linear low-density, and high-density polyethylene.
- **HDPE**. High-density polyethylene: a thin, stiff, crinkly film that's cheap per bag but splits rather than stretches once punctured.
- **LLDPE**. Linear low-density polyethylene: a stretchier, more puncture- and tear-resistant film used for sharp or heavy mixed waste.
- **LDPE**. Low-density polyethylene: an older, flexible film mostly replaced by LLDPE in modern liners; still used in some lower-end utility bags.
- **Oxo-biodegradable additive**. An additive blended into ordinary plastic so it degrades outdoors under UV and heat exposure; it is not certified compostable and is a different claim from a bio-based compostable resin.
- **Star seal**. A bottom seal folded and sealed inward at one spot with no gussets, giving the most leak resistance and the best fit to any can shape.
- **Flat seal**. A simple bottom seam sealed straight across, like a pillowcase; it's the most leak-prone seal under heavy or pointed loads.
- **Gusset**. A folded-in panel at the bottom sides of a bag that lets it expand to the bin's shape; the fold itself is a weak point for liquids.
- **Drawstring closure**. A cord sewn into the bag's rim that cinches and ties the bag shut in one motion.
- **ASTM D6400**. The US standard a plastic must pass to be labeled compostable in a municipal or industrial facility: 90% of the material must fully break down into CO2 within 180 days under test conditions.
- **BPI certified**. A third-party mark from the Biodegradable Products Institute confirming a bag actually meets the ASTM D6400 compostability standard it claims.
- **OK compost HOME**. A certification mark meaning a bag was tested to break down in an ordinary backyard compost pile, not just an industrial facility.
- **Post-consumer recycled content**. Plastic reclaimed from products people actually used and discarded, as opposed to scrap left over from the manufacturer's own production line.
- **Kraft paper**. The heavy brown paper some yard-waste bags are made from, used where local programs don't allow plastic bags for leaves and grass.
- **Store drop-off (film recycling)**. A take-back bin at some retail stores for plastic film like bags and wrap, separate from curbside bins; most trash bags still aren't accepted even there.

## Where we made a call

- LLDPE resists punctures and tears better than HDPE; HDPE is thinner and cheaper but splits once punctured. (confidence medium). Sources disagree. A commercial-supply buyer's guide states the reverse (HDPE has higher puncture resistance), against two independent sources that agree with the majority claim; we followed the majority and flagged the conflict. [1] [2] [3]

## References

1. [Trash Bag Mil Thickness Guide](https://wcsafety.com/blogs/reference/trash-bag-mil-thickness-guide) (specialist review). Supports: LLDPE gauge/duty table: 0.7-0.9 mil economy, 1.0-1.5 mil standard, 2.0 mil heavy, 3.0 mil contractor; HDPE micron/duty table: 6 to 16 micron, with 16 micron as the practical HD ceiling; 1 mil = 25.4 microns conversion stated directly; LLDPE stretches/survives a puncture; HDPE 'zippers' from any puncture; Standard liner size table mapping flat dimensions to gallon capacity, 7-10 gal up to 55-60 gal; Rodent-repellent liner exists as a named product category.
2. [Trash Bag Dictionary](https://www.plasticplace.com/pages/trash-bag-dictionary) (spec sheet). Supports: Standard trash bag gauge ranges 0.7-2.0 mil (LD/LLD) and 6.0-22.0 micron (HD); Kitchen bags typically 0.9 mil, contractor bags usually start at 3.0 mil; Star seal, flat seal, and gusset seal definitions and relative leak resistance; LLDPE highly resistant to punctures and tears, best for sharp/jagged waste; HDPE generally thin and more prone to tears; 4-inch overhang recommended to keep the bag gripping the can rim.
3. [The Ultimate Guide to Choosing the Right Commercial Garbage Bag](https://cleansourceinc.com/the-ultimate-guide-to-choosing-the-right-commercial-garbage-bag/) (specialist review). Supports: Star seal, flat seal, and gusseted seal definitions, star seal preferred for commercial use; States HDPE has higher tensile strength and puncture resistance than LLDPE (minority view, conflicts with wcsafety/plasticplace); Duty-class recommendations by use case (office, restaurant kitchen, construction site).
4. [Bin bag](https://en.wikipedia.org/wiki/Bin_bag) (primer). Supports: History of star-sealed, flat-sealed, two-ply and drawstring bag introductions; Closure types: wire twist ties, handles, 1984+ drawstrings; LDPE/LLDPE/HDPE as the common bin-bag resins; Oxo-biodegradable plastic definition and behavior.
5. [Biodegradable polymer (redirect: Compostable plastic)](https://en.wikipedia.org/wiki/Biodegradable_polymer) (primer). Supports: ASTM D6400 defined as the US standard for labeling plastics compostable in municipal/industrial facilities; Pass criterion: 90% of the material mineralized into CO2 within 180 days under aerobic composting test conditions.
6. [Best Compostable Trash Bags: Ultimate Guide](https://orizonbags.com/best-compostable-trash-bags-ultimate-guide/) (specialist review). Supports: BPI/ASTM D6400 industrial certification vs. OK compost HOME home-compostable certification as distinct claims across multiple brands; Compostable bag thickness commonly published between 0.6 and 1 mil, thinner than conventional kitchen bags; Star-sealed bottoms used even on compostable liners; Parallel standards referenced alongside ASTM D6400: EN 13432, AS 4736.
7. [Hefty Ultra Strong Kitchen Trash Bags (product page)](https://www.hefty.com/products/trash-bags/ultra-strong-kitchen-trash-bags) (spec sheet). Supports: Drawstring closure with break-resistant grip; Arm & Hammer branded continuous odor control as a named technology distinct from scent; Multiple named scent options plus a scent-free option; The bag itself is not recyclable or compostable while its box is recyclable.
8. [Hefty Ultra Strong Recovered Materials Trash Bags (product page)](https://www.hefty.com/products/trash-bags/recovered-materials-bags) (spec sheet). Supports: A mainstream line discloses combined post-consumer plus reclaimed scrap resin, an example of a partial recycled blend.
9. [30 Gallon Recycled Trash Bags (product page)](https://ifyoucare.com/products/recycled-trash-bags) (spec sheet). Supports: A specialty eco-brand discloses majority post-consumer recycled content, the high end of the tier.
10. [Leaf bag](https://en.wikipedia.org/wiki/Leaf_bag) (primer). Supports: Lawn and leaf bags typically made from paper or biodegradable materials, though some are plastic; Many municipalities require leaf bags for curbside collection specifically because they can be composted or recycled; Paper leaf bags are biodegradable and often required by local waste management services.
11. [Mint-X Rodent Repellent Trash Bags](https://www.mint-x.com/) (spec sheet). Supports: EPA-approved mint-scented additive engineered to repel rats, mice, raccoons and squirrels from trash bags.
12. [Plastic shopping bag](https://en.wikipedia.org/wiki/Plastic_shopping_bag) (primer). Supports: Plastic film bags, including reused trash bags, are in most cases not accepted by standard curbside recycling programs.
13. [Yard Waste](https://www.fairfaxcounty.gov/publicworks/recycling-trash/yard-waste) (regulator). Supports: A county program bans plastic bags for yard waste curbside collection and disposal, requiring paper bags instead.