Compostable Bin Bags: What Size Do You Need?
By Peace With The Wild | Published: 2026-10-21
Category: Buying Guides
Choosing the right size compostable bin bag depends on where you use it. This guide breaks down kitchen caddy, food waste, and garden bag sizes so you can pick the perfect fit.
Quick answer
Match your bag size to your bin: 8–11.4 litre bags work for small kitchen caddies, 10 litre bags fit standard food caddies, and 90 litre bags handle garden waste. Measure your bin's width and depth first.
Why size matters for compostable bags
Compostable bin bags come in specific sizes because they are designed to fit particular bins and uses. Using a bag that's too small can cause leaks and mess, while one that's too large may not stay in place and can tear under the weight of contents. Getting the size right ensures the bag performs as intended and degrades properly.
Unlike plastic bags that stretch, compostable bags are less elastic. They rely on a good fit to hold their shape and avoid splitting. Always check your bin's internal dimensions before buying.
Common compostable bag sizes explained
The most common sizes for household compostable bags are 8 litres, 10 litres, 11.4 litres, and 90 litres. The smaller sizes (8–11.4 litres) are designed for kitchen caddies and food waste containers. The 90 litre size is for garden waste collection.
Don't assume a bag labelled 'food waste' will fit your caddy. Check the litre capacity and measure the height and width of your bin. A bag that's too tall can fold over and block the lid, while a bag that's too short may not cover the rim.
How to choose the right size compostable bin bag
- Measure your bin: Measure the width, depth, and height of your bin's interior. Write down the volume in litres if known. This is the most reliable way to match a bag size.
- Match litre capacity: Choose a bag with a litre capacity equal to or slightly less than your bin's volume. For example, an 8 litre bag fits an 8 litre caddy. A 10 litre bag fits a 10 litre caddy. A 90 litre bag fits a large garden waste bin.
- Consider bag features: Drawstring bags (like the 8 litre option) are easier to tie and lift. Standard open-top bags (like the 11.4 litre food waste bags) are fine for countertop caddies. For garden waste, look for thick, tear-resistant materials. If your bin is unusually shaped, measure the rim circumference to ensure the bag will drape over the edges.
Product facts
- 25 Compostable Drawstring Bin Bags – 8 Litre: 25 Compostable Drawstring Bin Bags – 8 Litre. Made from sustainable materials, degrades naturally leaving no microplastics. The 8 litre size is ideal for small kitchen caddies or bathroom bins, and the drawstring closure helps contain odours and makes tying easy.
25 Compostable Drawstring Bin Bags – 8 Litre - Compostable Food Waste Bags – 11.4L: Compostable Food Waste Bags – 11.4L. Made from GMO-free potato starch, certified OK Compost, fits all tall 13-gallon pails. At 11.4 litres, these bags suit larger food waste caddies and are certified compostable, so they can break down in industrial composting facilities.
Compostable Food Waste Bags – 11.4L
Who should buy which size?
Best for
- Small kitchen caddies (under 10 litres): 8 litre compostable drawstring bags
- Standard food waste caddies (10–12 litres): 10 litre or 11.4 litre compostable food waste bags
- Garden waste collection: 90 litre eco garden waste bags
Not for
- Large kitchen bins (over 20 litres): these compostable bags are not designed for general household rubbish
- Wet kitchen scraps without a caddy: compostable bags need a rigid container to hold shape
