In this design activity, learners create a vehicle that can transport a load, like a favorite toy or as a recycled object, from the top of a zipline to the bottom using only gravity. Ziplines are a method of transportation consisting of a sturdy cable set between two points on a downward slope. Activity includes a design framework for learners to use, suggested methods to setup the zipline, a list of suggested materials to build with, an activity video, and suggested extensions for adding a story component or an extra design challenge. A Spanish version of the activity is also available. Activity costs could be lower by using all recycled materials.