The manifesto focuses on strategies for incorporating sustainability into the design of Internet of Things (IoT) devices. We hope it helps to galvanise product designers, interaction designers, creative technologists and makers into action - the people who have the skills and know how to use materials and technologies to design future sustainable connected products. The IoT is rapidly expanding and it is beginning to have both advantages and disadvantages for our society and our planet. The manifesto might therefore also be of interest to environmentalists, connected product manufacturers, tech firms, politicians and legislators - those who campaign for sustainable change and those who have the power to deliver it.