Booster seat which doubles as a back pack, Ideal for holidays where hire care companies charge a fortune for hiring booster seats. Just bought one for my 6 year old and figuring I will get 6 years use out of it not too bad considering initial out lay. I am a great fan of the trunki suitcase so hoping this will also not disappoint. Free next day delivery from Kiddicare and also as I have not used them before I got a £5 credit for my next purchase! Bargain if you were planing on getting one anyway and they do seem to be out of stock everywhere elsse.