These poo bags are made with plant and corn starches. They will biodegrade easily once it is open to air and light however kept in the box or recycled pouch away from light, they will last for years.
If you also need a pouch, try the Starter Kit and get an amazing clip-on pouch made from recycled inner tubes!
Each box has 6 rolls, and each roll has 12 bags, giving you 72 bags in total. Enough to last for about a month on average.