Dear customers： I know if these pet wast bags are really biodegradable is a question important. In fact, there are two kinds of degradable bags on the market，one of them is made with EPI degradable material as the base，and the other one is corn-based. Due to the difference of production process, the EPI-based bags be defined 38% Biodegradable by USDA which looks more like plastic and more stronger also. But when these EPI-based bags are buried in the ground, they all be breaked down aerobically within a year. If you have the patience, you can do a little experiment to watch these dog poop bags disintegrate:) And in our shop also have those corn-based dog poop bags which be defined 100% Biodegradable by USDA，choose them as you like:) In addition, EPI Environmental Technologies Inc. (EPI) and its UK subsidiary EPI (Europe) Limited, founded in Canada in 1991, are world leaders in the fight against plastic waste pollution: Plastic that escapes into the open and cannot be collected for recycling can be biodegraded by oxidation and returned to the wild when made using EPI's TDPA oxidizable biodegradable technology.