This harness was way less bulky than carrying a carseat on the plane. The last time we took our son on a plane trip, he was small enough to fit in our laps. This time he was 3, so we had to buy a ticket for him. The turbulence on the way to Orlando and the rough landing made me really glad we got this device. It was very easy to put around the seat and did not bother the passenger behind us in any way. The harness comes with an airplane-style card instructions, business cards for passing to other people interested in the device, an instructional dvd (I didn't view it because the card instructions were so easy to understand) and a convenience carry case to store it in while not in use. My son didn't seem to mind it, simply because he's used to a harness in his carseat. Let's be honest, carseat or restraint system won't matter much in a plane crash. I feel comfortable saying that if we ever had to make an emergency landing, the system would be just as effective as a carseat.