Resealables are made with 100% Green Plastic from Sugarcane and have obtained the I'm Green BioBased Seal. The bags went through ASTM D6866-18 Method B (AMS) testing. This tests the BIOBASED content of a product. 100% Biobased Carbon indicates that a material is entirely sourced from plants or animal by-products and 0% Biobased Carbon indicates that a material did not contain any carbon from plants or animal by-products. A value in between represents a mixture of natural and fossil sources. Polyethylene is conventionally produced from non-renewable Fossil raw materials such as oil or Natural gas but now there is a better option, Green Polyethylene from sugarcane. GreenPolly is one of the first resealable Sandwich & snack bags to be made 100% of a renewable source (Green Polyethylene from sugarcane) - we are a pioneering, new brand and hope you will join us in this journey of a more sustainable future.