Do you have to use the rolling base to support the weight of the bag? Yes, the rolling base allows YOYO to retain all its stability and manoeuverability once the bag is installed and loaded. Other items that may interest you Is YOYO bag compatible with all YOYO strollers? How is YOYO bag installed? Is YOYO bag washable? What is the capacity of YOYO bag? Can you fold YOYO with the rolling base of YOYO bag attached?