Have you ever encountered the Goldilocks problem with your trash bags? You wrestle a new liner into the kitchen bin, and it’s immediately clear you’ve made a terrible mistake.
Either it’s comically oversized or frustratingly too small, destined to slip down the second you toss in an item.
This handy kitchen trash bag size guide will help you find the perfect fit for your bin and introduce you to more sustainable options that reduce plastic waste.
Why the right kitchen trash bag size matters
It might seem like a small detail, but using the correct bin bag size is a win for you and the planet for three simple reasons:
1. You’ll reduce plastic waste.
Every time you use a bag that’s too large for your bin, you’re using unnecessary plastic. Over the course of a year, that amount of wasted plastic really adds up.
2. You’ll save money.
Why pay for ill-fitted plastic rubbish bags you don't even need? Using the right size means you’re not literally throwing money away.
3. There’ll be less mess.
A bag that fits perfectly is less likely to slip down inside the can, rip when you’re taking it out or cause a gross garbage juice situation. A clean bin makes for a happier household.
Decoding kitchen rubbish bag sizes: a simple guide
Shopping for bin bags can be a bit confusing with the different numbers and dimensions. But here’s what you really need to know.
Know your volume in metric and imperial systems
The most important number to look for is the capacity, usually in litres (L). Yes, Americans still insist on using the imperial system, so you’ll sometimes see gallons (gal) and quarts (qt) depending on where you’re shopping.
Check the bottom of your bin — the capacity is often stamped right there.
Learn common kitchen bin sizes
While bins come in all shapes and sizes, the most common kitchen trash bag size is approximately 40 to 50 litres. In the US, this is often sold as a 13-gallon tall kitchen trash bag.
Other sizes you might find are 30L for bins under kitchen sinks or 60L for larger households.
How to measure your trash bin size
No idea what size your bin is? Grab a tape measure to get the answer.
For a round bin, measure the diameter (the distance straight across the top) and the height. For a rectangular bin, measure the width, depth, and height. Plug these numbers into Omni’s garbage bag size calculator to find your perfect match.
Let's talk about sustainable trash bag materials
Once you know your size, you can choose a better material. Traditional rubbish bags are made from virgin plastic, but there are less wasteful alternatives available.
100% Recycled plastic garbage bags
These bin bags are made from post-consumer recycled (PCR) plastics, which is a fancy way of saying they’re made from old plastic that has been given a new life.
Choosing recycled bags helps reduce the demand for new plastic production and minimises waste in landfills and oceans.
Compostable food bags
Made from plant-based materials like corn starch, these bags are designed to break down completely in a commercial composting environment.
They make it simple to collect and store food scraps. Once full, you can often toss the whole bag right into your council’s green bin (but be sure to check your local rules first).
Bio-based plastic bags
You’ll also see bags labelled as "bio-based" or "biodegradable." While these sound great, the terms can be a bit misleading.
Bio-based bags are derived from plant sources, which reduces our reliance on fossil fuels. But as WebMD notes, biodegradable plastics need specific conditions to actually break down. If they end up in a typical landfill, they are deprived of oxygen and can release methane, a potent greenhouse gas.
For general household waste, we believe using bags made from 100% recycled plastic is the most impactful and straightforward sustainable choice.
Meet your perfect match: our sustainable garbage bags
Ready to find your kitchen bin’s soulmate from Who Gives A Crap? We’ve created a range of garbage bags that are super strong, durable and made with the planet in mind.
100% Recycled Rubbish Bags
Designed to handle whatever you throw at them, these recycled trash bags are tough, reliable and kinder to the planet than their virgin plastic cousins. They come in two sizes:
Large kitchen bags with a 50-60L (13 gal) capacity, perfect for most standard kitchen bins.
Small bags with a 15L (4 gal) capacity, for use in smaller bins throughout the house.
Food scrap compost bags
These compostable kitchen bags are the perfect partner for your food scrap caddy. They fit up to 12L (or 3 gal) bins and are certified to break down in industrial compost. They make diverting food waste from landfills easy, remaining strong and durable for even the messiest meals.
Conclusion — Take out the trash, not the planet
Choosing the right size and material for your kitchen trash can is a small change with a big impact. It’s an easy and effective way to reduce your household's plastic waste and make your home a little more sustainable, one trash day at a time.
End the frustration of bags that are too big or too small. Find your perfect fit from our kitchen collection.