Used. Very sturdy. Accommodates all BRITAX Convertible Car Seats and Harnessed Booster Seats, and most other car seat brands (we used with the Cosco travel car seat) Product Features: Attachment using the car seat’s lower connectors for quick and simple use Compact fold stows into small spaces including most airplane overhead compartments Steel frame design for strength and durability. No assembly required. Raised platform protects the car seat from contacting the ground Easy-glide wheels for a smooth transport of your car seat and its passengers Allows for transport of children harnessed in car seats for short travel distances One-hand telescoping handle with two positions to accommodate all size users Accommodates all BRITAX Convertible Car Seats and Harnessed Booster Seats, and most other car seat brands