Was just reading recently about the fact that there is only one true 100% biodegradable sposie - just subbing til I find it for you.

ETA: Ok found it on femail, they are called Safeties Nature Nappies and they are sold at Macro. Many of the others use organic materials but do not break down 100% like these do.
HtH.
Unles they have fixed the problem I remember these being pulled as they were not 100% biodegrable? It was considered false advertising? Hope they have created a 100% one I will buy them for sure!
Here some info about the bamboo nature ones
contain no perfumes, lotions, deodorants or antioxidants
are made from raw materials that are certified free from harmful chemicals
are 100 % chlorine, TBT and latex free, so they are much less likely to cause an allergic reaction
can help to prevent and reduce nappy rash
have been recommended by the Eczema Association of Australia, and are designed and tested by the manufacturer for skin friendliness
are highly absorbent, perfect for using overnight
encompass the full range from premature to training pants (see size chart)
have an eco friendly manufacturing process which means a lower eco footprint
are approximately 75% biodegradable as opposed to the 35% in standard nappies
have a biodegradable core with biodegradable starch granules
come in fully recyclable packaging
are the first nappy to be awarded the Nordic Swan Eco Label
are made in Denmark, and shipped to Australia. Shipping is an environmentally friendly form of mass transporting