OpBox is a company under the Even Keel Group that specializes in making buildings from composite fiber panels made of recycled PET plastic. Their structures can be customized for commercial, community, or residential use, including backyard studios. By utilizing recycled materials, OpBox contributes to sustainability efforts by diverting millions of plastic bottles from landfills and oceans. They offer a unique construction material called EDURA, engineered to replace traditional building components with a single structural panel, resulting in durable and energy-efficient structures that exceed Passive House air change standards.