Glad biobased bags contain 50% plant-based plastic. By replacing a portion of fossil fuel plastic with plastic sourced from renewable resources, this greener alternative has a smaller carbon footprint. In addition to helping reduce greenhouse gas em Glad biobased bags contain 50% plant-based plastic. By replacing a portion of fossil fuel plastic with plastic sourced from renewable resources, this greener alternative has a smaller carbon footprint. In addition to helping reduce greenhouse gas emissions, biobased bags have the trusted strength of Glad and are designed to handle your rubbish on its way to the landfill.