This case study explores the plastic waste value chain in Bangkok to better understand the contributions of – and links between – formal and informal actors in plastic waste management. The insights from this study hopefully will help determine a range of policy measures that work to enhance the contributions of all level of waste collectors and thus the environmental and economic benefits of an integrated plastic waste management system.The study centred on plastic waste management in the Bangkok metropolitan area, and specifically in Sai Mai District for more in-depth research. Sai Mai District is one of three waste collection and transportation systems run by the Bangkok Metropolitan Administration (BMA), with waste composition and waste stream flows comparable to many of the city’s 50 other districts.