Behavioural insight interventions, alongside traditional policy measures, offer promising solutions to nudge  consumers away from single-use-plastic consumption. A toolkit developed from pilot projects based in four ASEAN countries namely Indonesia, the Philippines, Thailand and Viet Nam provides practical steps and examples. Proactive engagement and a commitment to learning drove these pilots, showcasing the potential for scalability. Challenges remain in shifting behaviors, ensuring sustainable alternatives, and engaging governments. Building alliances and establishing clear evaluation measures are crucial for addressing these challenges in future initiatives.