Best Composters — 300L + Plastic (2026)
2 composters matching capacity “300L” + material “Plastic”, 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
£39.99
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
£42.99
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