Maisitc 2. Gen home compostable food bags are made from the plant residues that would usually be treated as waste - burned or otherwise disposed of. These food bags are certified compostable, meaning that they are fully bio-degradable in your own compost bin. The bags come in a box which is marked with a ‘use before\' date as these compostable bags have a natural shelf life of 1 year. No phthalates or other harmful chemicals No plasticisers used in traditional plastics suitable for cold storage, freezing and storage at room temperature 20 bags