KidWise Dueling Back To Back Waterpark This is like your own WaterPark in your back yard! Make sure you have room for this 40 FOOT LONG action packed unit. Four kids can slide on 4 different slides at once. Up to a 200 lb total weight limit on the inflated slides and 2 additional kids can slide on the tunnel slides. The overall dimensions are 40'X16.8'X10' - it's HUGE!