Laundry detergent bottles are typically made from plastics like HDPE and PET—materials chosen for their durability and barrier properties, but also responsible for persistent microplastic pollution and chemical hazards. In this project, the team set out to rethink detergent packaging from the ground up by asking a simple question: Can a container perform like plastic without relying on it?
Using a green chemistry framework, the team worked with household homecare brand ECOS to evaluate alternatives based on technical performance (strength, moisture and oxygen barriers, and temperature stability) alongside environmental and human health impacts. Rather than searching for a single “perfect” replacement, the project explored layered material strategies inspired by carton packaging—separating structural and barrier functions to combine the strengths of multiple bio-based materials.
The analysis identified three promising concepts: a bamboo–PLA composite with a clay-reinforced coating, a zein protein base paired with a plant-derived cutin barrier, and a bioplastic PHA blend that could function as a stand-alone material. Each approach reduces reliance on virgin petrochemical plastics while offering improved end-of-life pathways such as compostability or biodegradability. While none perfectly matches HDPE’s mechanical performance, the findings suggest that safer, plant-based packaging systems could realistically replace conventional detergent bottles with further optimization.