bought this on amazon after watching a re-run on dragon's den, couldn't find stock anywhere else. Our four year old daughter used it as her hand luggage, as although it's not massive inside, she did manage to put in a change of clothes, a colouring book and pens, a teddy and some snacks. She was able to open it up into the car seat, without any difficulty and the seat itself, is rigid and very sturdy. She loves it and wants to use it at home. A brilliant buy for holiday travelling.for long journeys, you may want to take extra padding, but our normal booster seat is the same.