Such a simple ideas gives a whole new life to a normal cardboard box.
Kids love cardboard boxs- Fact! Trains,cars,planes etc they are fantastic for role playing and imaginative play.
These are reusable plastic wheels that attach to any cardboard packing box. My girls (3 and 16 mths) adore this and love filling boxes with teddies and using the pull cord to give them rides round the house.
Great for recycling too.