The Brica transporter attaches to a convertible car seat/booster car seat and instead of lugging around the car seats through the terminal, you can have your kid sit in her seat and pull her along. Not only does it save your back but it also seems be quite fun for the kids riding along. The product is high quality and the design allows the wheels to be folded in so that when it is time to put the seats in the rental car, there is no need to remove the transporter from the seat! Very convenient. One suggested improvement to the product would be to make the platform on which the car seat sits a bit longer.