Sustainable Push is a Chrome extension developed by Celine Ekelund, available for free in the Browsers category under Add-ons & Tools. This extension is designed to work exclusively on Zalando.com, providing users with notifications every other minute while browsing the site. These notifications redirect users to Sellpy.com, offering similar products they were viewing on Zalando but in a second-hand option. For instance, if you were searching for "Nike shoes" on Zalando, the notification will link you to "Nike shoes" on Sellpy. The primary goal of this extension is to remind users about the option to shop sustainably by purchasing second-hand items from Sellpy instead of buying newly produced goods from Zalando.