In our daily life, it is important to choose the right trash bag for trash cans of different sizes. 3 gallon trash bags are more common bags. This article will focus on what size trash bag for 3 gallon can. Whether you want to buy a bathroom, office or kitchen countertop trash can, this article can meet your needs.
What Is a 3 Gallon Trash Can?
A 3 gallon trash can is a small trash can with a capacity of about 11-12 liters. Typical dimensions include:
Diameter: 20-25 cm (8-10 inches), Height: 30-36 cm (12-14 inches)
This type of trash can is suitable for:
- Bathroom
- Bedroom
- Dormitory
- Office
- Pet waste collection station
- Small compost bin
This type of trash can is compact and is usually placed under the sink, next to the toilet or next to the desk. This type of trash can comes in a variety of shapes: round, square or rectangular.
What Size Trash Bag Fits a 3 Gallon Can?
The ideal trash bag size for a 3 gallon can is around 16 inches wide by 17 inches tall (approximately 40 cm x 43 cm).
Why This Size?
It gives a few inches of overhang to tie the bag.
Prevents the bag from falling inside the bin.
Allows space for light waste or food scraps.
You can also use this formula to calculate bag size:
Bag Width = (Bin circumference ÷ 2) + 3"
Bag Height = Bin height + 4" to 6"
This sizing method is commonly used by manufacturers and suppliers of compostable trash bags.
Types of Trash Bags That Fit 3 Gallon Cans
Made from PBAT, PLA, and cornstarch
Certified biodegradable
Ideal for food waste, bathroom use, or sustainable homes
2. Biodegradable Trash Bags
Break down over time but may leave residue
Not always certified for composting
3. Plastic Trash Bags
Common, cheap
Not eco-friendly
May tear or not fit snugly
4. Drawstring Trash Bags
Easier to close and remove
Less common in small sizes
5. Flat Seal vs. Star Seal
Flat-seal bags are cheaper but less leak-proof
Star-seal bags offer better flexibility and sealing
Can You Use Compostable Bags in a 3 Gallon Can?
Yes, absolutely.
Compostable 3 gallon trash bags are designed specifically for small bins and are popular in eco-conscious households. They break down naturally in industrial or home compost environments, depending on their certification.
Look for These Certifications:
-
BPI Certified (ASTM D6400) – U.S. standard
-
EN13432 – European Union composting standard
-
TÜV OK Compost HOME – Safe for backyard composting
If you're a wholesaler or brand sourcing bags, working with a certified compostable bag manufacturer ensures your products meet international regulations.
What Happens If You Use the Wrong Size Bag?
-
The bag to slip into the bin
-
Overhang that looks messy
-
Not enough space to tie the top
-
Increased risk of spills or tearing
Choosing the right fit improves hygiene and user experience—especially important for commercial settings like hotels, clinics, or offices.
How to Measure Your Trash Can for a Bag
If you are unsure what size trash bag you need, round and rectangular trash cans follow these steps:
- Measure the height of the trash can - from the bottom to the top
- Measure the width - at the widest point
- Calculate the circumference - (width x 2 for round trash cans)
FAQ
What is the best trash bag size for a 3 gallon bin?
The best size is 16 x 17 inches (40 x 43 cm). It offers enough room for overhang and tying, without excessive extra material.
Are 3 gallon and 11-liter bins the same?
Yes. 3 gallons = 11.3 liters, so trash bag sizing is compatible across both units.
Can I use a 4 gallon bag for a 3 gallon can?
Yes, but expect a loose fit or bunching at the bottom. For tight fit, stick with 3 gallon bags.
Can I use grocery bags in a 3 gallon bin?
You can, but they may not fit well and aren’t compostable. They can tear or leak.
Where can I buy 3 gallon compostable bags?
You can buy them on Amazon, Target, Walmart, or directly from manufacturers like Orizon Biomaterials, a certified factory in China.
Conclusion
Choosing the correct trash bag size for your 3-gallon bin isn’t just about convenience—it’s about efficiency, hygiene, and sustainability. From understanding dimensions and bag materials to learning about certifications and sizing formulas, you now have all the tools to make the best decision. Whether you opt for compostable, biodegradable, or standard liners, always choose a size that fits well, supports your lifestyle, and aligns with your environmental goals.
