Biobased - 0% traditional plastic Wave cut for easy tying 20L Size 14 Bags Maisitc 2. Gen Compostable Waste bags are made from a patented bio-plastic material based on organically grown and GMO-free corn. The rounded bottom of the bag enforces it and minimizes risk of leakage. Maistic recommends a new waste bag every second day to avoid too much heavy waste decomposing too quickly with the bag, and to avoid bacteria and bad smell. Decompose it together with your kitchen bio-waste in a suitable compost bin to create rich soil for your garden. 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.