Baby Jogger City Mini Double Stroller: Compatible Infant Car Seats The Joolz Geo amazingly complete wherever you go! The Joolz Geo is designed to grow with your family. To extend the Joolz Geo to a duo stroller, just click in Important Reminder! The handle of our baby car seats isnt just great for carrying the seat.. It also has a safety function. Always remember to put it in an upright position when you use it in the Valco Snap Duo Trend Double Stroller