It is a bit of a myth. They still degrade just not as fast as in a compost or worm farm. I think eenees are supposed to degrade in about 4 weeks in a compost. From our experience I would say that is pretty close. We really like Bambos but just wish we could be sure about the best environmental option as each nappy manufacturer puts their own spin on it. So I guess we are happy with our choice. As far as quality goes Bambos are really good. We do just put them in a bin because they aren't 100% so we can't really put them in the compost. Safties come with their own biodegradable nappy bags. My only warning about them is to check the sizing as we got the 5-10kg ones and they were too small forDS when he was about 7 kg.