They are huge carts. On wheels. With a sort of pulley handle. That have started appearing. Left in front of every exhibit, in every zoo, museum, kids activity in general....dragged along by smug middle class dads usually, who are of course the first people on earth to ever have children...cos little Araminta and Finn might DIE if we don't lug ten tons of their crap around with us for one single day out somewhere. What the hell are these things in aid of? What have you even got in there? You look at the kids, they are like 9 years old, can they not carry a little backpack? Just awful.