Most plastics take up to 400 years to break down; however, even though these 'd2w™' white swing bin bags are made from combinations of polypropylene and polyethylene, they are designed to include 1-3% metal salt additives, rendering them biodegradable.  When exposed to heat, light or landfill conditions, they break down completely into water, CO2 and a small amount of biomass - a process which takes around 18 months. This process leaves no toxic residue, and emits no methane.

Dimensions: 17x18 inches, with a capacity of 20 litres.  Sold in rolls of 30.