Best Composters — 300L + Mid-range (2026)
6 composters matching capacity “300L” + price tier “Mid-range”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Compost Bin UK (2026) guide.
#1 Pick
4smile 300 Litre Garden Composter Bin, Composting Waste Box, BlackRated 4.2 out of 5 stars (512)
- Plastic
- Large gardens
- 300L
£29.39
Pros
- Generous 300L capacity at a budget price
- Lightweight recycled plastic construction
- Hinged lid keeps out rain and pests
Cons
- Basic single-chamber design with no aeration vents
#2 Pick
KCT Garden Compost Bin, 300L, Eco Friendly Waste ComposterRated 4.1 out of 5 stars (267)
- Plastic
- Large gardens
- 300L
£41.95
Pros
- 300L capacity suits medium to large households
- Weatherproof, UV-stabilised plastic
- Simple click-together assembly
Cons
- Lid catch can feel flimsy under heavy use
#3 Pick
Denny International 300L Outdoor Compost Bin, Eco Friendly Garden Waste ConverterRated 4.2 out of 5 stars (341)
- Plastic
- Large gardens
- 300L
£25.98
Pros
- 300L capacity suits medium to large gardens
- Hinged lid for easy top-loading
- Durable, leak-proof plastic construction
Cons
- No base plate included
#4 Pick
VOUNOT Compost Bin Garden, 300 Litre Plastic Composter, BlackRated 4.3 out of 5 stars (512)
- Plastic
- Large gardens
- 300L
£38.24
Pros
- Bottom access panel for easy compost removal
- Lightweight yet sturdy black plastic build
- 300L capacity for everyday garden waste
Cons
- Basic single-chamber design
#5 Pick
Easy Shopping Garden Compost Bin, 300L Outdoor Composting Container with Hinged LidRated 4.4 out of 5 stars (118)
- 300L
- Plastic
Currently unavailable
Pros
- Durable, waterproof construction
- Hinged lid for easy top-loading
- Budget-friendly 300L capacity
Cons
- Assembly clips can be fiddly to click into place
#6 Pick
DIVCHI 300L Garden Compost Bin - Outdoor Composting Container, UV-Protected, BPA-FreeRated 4.2 out of 5 stars (72)
- 300L
- Plastic
£30.29
Pros
- BPA-free, UV-protected plastic construction
- Removable front hatch for easy access to compost
- 300L capacity for kitchen and garden waste
Cons
- No base included, so bin sits directly on soil
At a glance
- Products
- 6
- Price range
- £25.98–£41.95
- Average price
- £33.29
- Average rating
- 4.23 / 5
- Total reviews
- 1,822
- Top brand
- 4smile (1)
- In stock
- 5