The Tommee Tippee potty is fantastic. It is for children aged from 15 months and comes in a wipe clean plastic bag with a carry handle. This can easily be hung over the handle of the pushchair. They are really easy to use just snap the legs into place insert a plastic bag which has a deodorized smell and an absorbant pad in the bottom and it is ready for use. Once the child has finished simply remove the bag tie up the handles and throw in the bin. The potty is now ready for your next emergency stop. I can't rate this enough it is much easier than having to carry around an ordinary potty or try and find a toilet in an emergency.