Choosing the right trash bag size depends on your trash can capacity, bin shape and the amount of overhang needed to secure the bag around the rim.
For most household kitchens, the standard trash bag size is 13 gallons, or about 50 liters. Small bathroom and office bins usually use 3-8 gallon bags, while large indoor, commercial and outdoor bins often need 30, 33, 45 gallon, 120L or 240L liners.
Use the chart below to compare common trash bag sizes in gallons, liters, inches and centimeters.
Quick Answer
The most common kitchen trash bag size is 13 gallons, approximately 50 liters. A 30L bin usually fits an 8 gallon bag, a 50L bin usually fits a 13 gallon bag, and large commercial bins often use 30-45 gallon bags or 120L-240L liners.
If you are not sure which size to choose, measure the bin opening and height, then choose a bag with enough width and 3-6 inches of extra length for overhang.
Trash Bag Sizes Chart: Gallons, Liters, Inches and CM
The chart below compares common trash bag sizes by capacity, approximate flat dimensions and typical bin use. Actual dimensions may vary by manufacturer, bag style and sealing method, so B2B buyers should always confirm the final specification before ordering.
| Trash Bag Size | Liter Equivalent | Approx. Flat Dimensions | Approx. CM | Common Bin Type | Typical Use |
|---|---|---|---|---|---|
| 3 gallon | 11L | 17 x 18 in | 43 x 46 cm | Small bathroom bin | Light waste |
| 5 gallon | 19L | 19 x 21 in | 48 x 53 cm | Bathroom / office bin | Paper, tissues, light waste |
| 8 gallon | 30L | 22 x 24 in | 56 x 61 cm | Small kitchen bin | Daily household waste |
| 13 gallon | 49-50L | 24 x 30 in | 61 x 76 cm | Standard kitchen trash can | Kitchen waste, food scraps |
| 30 gallon | 114L | 30 x 36 in | 76 x 91 cm | Large indoor bin | Office, restaurant, facility waste |
| 33 gallon | 125L | 33 x 40 in | 84 x 102 cm | Commercial trash can | Commercial and janitorial waste |
| 45 gallon | 170L | 40 x 46 in | 102 x 117 cm | Large outdoor / contractor bin | Heavy-duty waste |
| 120L liner | About 32 gal | Custom by bin shape | Custom | 120L wheelie bin | Municipal and commercial waste |
| 240L liner | About 63 gal | Custom by bin shape | Custom | 240L wheelie bin | Outdoor and wheelie bin collection |
This chart is especially useful for buyers comparing trash bag sizes in gallons and liters, since different regions use different measurement systems.
For example:
33 gallon bags equal about 125 liters, often used for large outdoor bins.
13 gallon trash bags are about 50 liters and commonly used for kitchen bins.
What Is the Standard Trash Bag Size?
The standard trash bag size for most household kitchens is 13 gallons, which is approximately 49-50 liters. This size is commonly used for tall kitchen trash cans in the United States.
For smaller kitchen bins, bathroom bins or office bins, 3-8 gallon bags are usually enough. For large indoor bins, restaurants, offices and commercial waste systems, 30 gallon and 33 gallon trash bags are more common.
Kitchen Trash Bag Size
The most common kitchen trash bag size is 13 gallons, or about 50 liters. This size fits many standard tall kitchen trash cans and is widely used for household kitchen waste, food scraps and daily indoor waste collection.
Smaller kitchen bins may use 8 gallon or 30L bags. Larger kitchen or food service bins may require 20-30 gallon bags, depending on the bin height, waste volume and bag thickness.
| Kitchen Bin Capacity | Recommended Bag Size |
|---|---|
| 10-20L small food waste bin | 3-5 gallon bag |
| 30L kitchen bin | 8 gallon bag |
| 45-50L kitchen bin | 13 gallon bag |
| 75-110L commercial kitchen bin | 20-30 gallon bag |
| 120L food service bin | 120L liner |
Why Trash Bag Size Matters
Choosing the correct trash bag size reduces leaks, tearing, and bag slipping.
A bag that is too small tears easily and won’t tie properly.
A bag that is too large wastes material and increases cost.
For compostable trash bags, fit matters even more because tight fits and overfilling can increase break risk in wet waste use.
Standard Trash Bag Sizes and Their Common Uses
Trash bags are usually selected based on bin capacity, waste type, and application environment. Although there is no single universal size standard, several capacities are widely used across different markets.
Small trash bag sizes
Small trash bags are commonly used for bathroom bins, office desk bins, and small countertop waste containers. Sizes in this category usually range from 3 gallon to 8 gallon.
Typical sizes include:
- 3 gallon
- 5 gallon
- 8 gallon
For compact kitchen or office bins, see our 8 Gallon Trash Bags.
Standard kitchen trash bag size
The most common standard kitchen trash bag size is 13 gallon, which corresponds to about 50 liters.
This size is widely used in household kitchens, food waste bins, and indoor waste collection systems.
For kitchen and food waste use, see our 13 Gallon Trash Bags.
Large trash bag sizes
Large trash bags are commonly used in commercial environments such as restaurants, offices, schools, and public facilities.
Typical large sizes include:
- 30 gallon trash bags
- 33 gallon trash bags
- 45 gallon trash bags
For larger capacity applications, explore our 30 Gallon Trash Bags , 33 Gallon Trash Bags and 45 Gallon Trash Bags .
Bin liners for commercial and municipal systems
In European and Australian markets, trash bag sizes are often listed in liters instead of gallons.
Among the most common commercial sizes are 120L bin liners and 240L wheelie bin liners.
For these systems, browse our 120L Bin Liners and 240L Wheelie Bin Liners.
Trash Bag Sizes in Gallons and Liters
Many buyers search for trash bag sizes in either gallons or liters. Understanding the conversion helps international buyers compare specifications more accurately.
Trash bags are usually labeled in gallons in the United States and liters in Europe and Australia.
The conversion is simple:
1 gallon = 3.785 liters.
Here are some of the most common conversions:
| Gallon Size | Liter Equivalent |
|---|---|
| 3 gallon | 11L |
| 5 gallon | 19L |
| 8 gallon | 30L |
| 13 gallon | 50L |
| 30 gallon | 114L |
| 33 gallon | 125L |
| 45 gallon | 170L |
| 63 gallon | 240L |
This gallon-to-liter reference is especially useful for buyers comparing garbage bag sizes, bin bag sizes, and bin liner size guides across different countries.
For example:
- 8 Gallon Trash Bags are roughly equivalent to 30L bin liners
- 13 Gallon Trash Bags are roughly equivalent to 50L bin liners
- 30 Gallon Trash Bags are roughly equivalent to 114L liners
- 33 Gallon Trash Bags are roughly equivalent to 125L liners
- 45 Gallon Trash Bags are roughly equivalent to 170L liners
- 240L Wheelie Bin Liners are roughly equivalent to 63 gallon liners
How to Measure the Right Trash Bag Size
If you are not sure what size trash bag you need, the easiest method is to measure the bin directly.
Step 1: Measure the bin width or diameter
For round bins, measure the diameter.
For rectangular bins, measure the width and depth.
Step 2: Measure the bin height
Measure from the bottom of the bin to the top rim.
Step 3: Add extra length for overhang
A trash bag should extend above the rim so it can fold over securely. In most cases, adding several inches of extra height helps improve fit.
Step 4: Match the waste type to the bag thickness
Light indoor waste may require a thinner bag, while food waste, outdoor waste, or contractor waste may require a thicker liner.
This method works for most household, office and commercial bins, especially when the bin capacity label is missing or when the bag needs extra overhang for tying.
Trash Bag Size Calculator: How to Measure Your Bin
If you do not know the capacity of your trash can, measure the bin opening and height to estimate the right bag size.
For Round Trash Cans
- Measure the diameter of the bin opening.
- Multiply the diameter by 3.14 to estimate the circumference.
- Divide the circumference by 2 to estimate the minimum flat bag width.
- Measure the bin height.
- Add 3-6 inches for overhang and tying.
Formula:
- Flat bag width = diameter x 3.14 / 2
- Bag length = bin height + half the diameter + 3-6 inches
For Rectangular or Square Trash Cans
- Measure the width and depth of the bin opening.
- Add width + depth to estimate the minimum flat bag width.
- Measure the bin height.
- Add half of the shorter side plus 3-6 inches for overhang.
Formula:
- Flat bag width = width + depth
- Bag length = bin height + half of the shorter side + 3-6 inches
What Size Trash Bag for 30L, 50L, 120L and 240L Bins?
Many trash cans are labeled in liters instead of gallons. Use the table below to match common liter-based bin sizes with suitable trash bag sizes.
| Bin Size | Recommended Trash Bag Size | Notes |
|---|---|---|
| 10L bin | 3 gallon bag | Small bathroom or food scrap bin |
| 20L bin | 5 gallon bag | Small kitchen or office bin |
| 30L bin | 8 gallon bag | Compact kitchen bin |
| 45L bin | 13 gallon bag | Medium kitchen bin |
| 50L bin | 13 gallon bag | Standard tall kitchen bin |
| 80L bin | 20-25 gallon bag | Large indoor bin |
| 120L bin | 120L liner / about 32 gallon | Wheelie bin or commercial bin |
| 240L bin | 240L liner / about 63 gallon | Large outdoor wheelie bin |
Trash Bag Dimensions in Inches and CM
Trash bag dimensions are usually measured as flat width x bag length. Flat width is not the same as bin diameter. For a good fit, the bag must be wide enough to cover the bin opening and long enough to fold over the rim.
For OEM and wholesale orders, dimensions can be customized based on bin size, film thickness, sealing method, roll count and packaging format.
Trash Bag Thickness Chart: Microns and Mil
Trash bag size determines fit, but thickness determines strength. Light dry waste can use thinner bags, while food waste, wet waste, outdoor waste and contractor waste need stronger film.
| Waste Type | Suggested Thickness | Approx. Mil | Common Use |
|---|---|---|---|
| Light bathroom or office waste | 10-12 microns | 0.4-0.5 mil | Paper, tissues, dry waste |
| Standard kitchen waste | 12-18 microns | 0.5-0.7 mil | Daily kitchen waste |
| Wet food waste | 18-25 microns | 0.7-1.0 mil | Compostable food waste bags |
| Commercial waste | 20-30 microns | 0.8-1.2 mil | Restaurants, offices, facilities |
| Heavy-duty outdoor waste | 30+ microns | 1.2+ mil | Contractor, garden and bulky waste |
Trash Bag Size Guide by Use Case
Different waste environments require different bag capacities. Below are some common use cases.
Bathroom and office bins
Small bins in bathrooms, bedrooms, and offices usually need small trash bags. These are often used for light waste and low daily volume.
Kitchen trash cans
Kitchen bins usually require medium-capacity bags. In many homes and food service environments, 13 gallon trash bags are considered the standard size.
For standard kitchen waste collection, view our 13 Gallon Trash Bags .
Large indoor commercial bins
Commercial kitchens, offices, schools, and facility management systems often use 30 gallon or 33 gallon bags.
For these applications, see our 30 Gallon Trash Bags and 33 Gallon Trash Bags.
Heavy-duty and contractor waste
Landscaping debris, construction cleanup, and outdoor facility waste often require 45 gallon trash bags with stronger film performance.
For heavy-duty use, explore our 45 Gallon Trash Bags.
Wheelie bins and municipal collection
Large outdoor bins and curbside systems commonly use 120L and 240L liners.
For these applications, browse our 120L Bin Liners and 240L Wheelie Bin Liners .
Tip: Bag height and overhang matter more than volume labels alone. A slightly taller bag helps tying and reduces slipping.
Related reading: Best Compostable Trash Bags (2026) — how sizing and thickness affect performance in wet waste use.
Trash Bag Sizes for Commercial Buyers
For commercial buyers, trash bag size should be selected based on bin capacity, waste type, daily waste volume and handling method.
Restaurants and food service operators commonly use 13 gallon bags for kitchen waste and 30-33 gallon bags for larger indoor bins. Facility management teams often need 30 gallon, 33 gallon or 45 gallon bags for offices, schools, public areas and outdoor waste stations. Municipal and curbside systems usually require 120L or 240L wheelie bin liners.
For OEM orders, buyers should confirm the final bag width, length, thickness, roll count, carton packing and printing requirements before production.
Compostable Trash Bag Sizes We Manufacture
ORIZON manufactures compostable trash bags and bin liners for distributors, wholesalers, retailers and private label brands worldwide.
Our most common sizes include:
- 8 Gallon Trash Bags for small kitchen bins
- 13 Gallon Trash Bags for standard kitchen trash and food waste
- 30 Gallon Trash Bags for large indoor bins
- 33 Gallon Trash Bags for commercial waste bins
- 45 Gallon Trash Bags for heavy-duty and contractor waste
- 120L Bin Liners for commercial bin systems
- 240L Wheelie Bin Liners for municipal and outdoor collection systems
Our factory features:
- 20,000㎡ production facility
- 16 automated production lines
- 500 tons monthly capacity
We support OEM manufacturing for distributors, wholesalers, and private label brands worldwide.
FAQ About Trash Bag Sizes
What size trash bag do I need?
To choose the right trash bag size, check your bin capacity first. If the capacity is not marked, measure the bin opening and height, then choose a bag with enough flat width and 3-6 inches of extra length for overhang.
What size trash bag fits a 32 gallon trash can?
A 32 gallon trash can usually fits a 33 gallon trash bag or a 120L liner, depending on the bin shape and rim size.
What size trash bag fits a 30 liter trash can?
A 30 liter trash can usually fits an 8 gallon trash bag. If the bin is tall or has a wide rim, choose a slightly taller bag to allow enough overhang.
How many gallons is a standard kitchen trash bag?
A standard kitchen trash bag is usually 13 gallons, which is about 49-50 liters.
What are the dimensions of a 13 gallon trash bag?
A common 13 gallon trash bag is approximately 24 x 30 inches, or about 61 x 76 cm. Actual dimensions may vary by manufacturer and bag design.
What size trash bag fits a 50 liter trash can?
A 50 liter trash can usually fits a 13 gallon trash bag.
What size trash bag fits a 120L bin?
A 120L bin usually needs a 120L liner, which is approximately equivalent to a 32 gallon bag.
How are trash bag sizes measured?
Trash bags are usually measured by capacity and flat dimensions. Capacity is shown in gallons or liters, while dimensions are usually shown as flat width x bag length.
Need Custom Compostable Trash Bags?
ORIZON manufactures compostable trash bags and bin liners for distributors, wholesalers, retailers and private label brands. We support custom sizes, thickness, colors, printing, roll packaging and carton packing for 8 gallon, 13 gallon, 30 gallon, 33 gallon, 45 gallon, 120L and 240L bags.
If you need a custom trash bag size for your market, send us your bin dimensions, target thickness and packaging requirements.
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