Our new car is at capacity with all of my display items and we couldn't bring our usual weights, a friend recommended gravity tubes and they worked very well. Luckily the art fair I participated in, had access to a fire hydrant so filling up the gravity tubes with water was very easy. Of course, disposal at the end of the show was even easier. During breakdown of the event, there was a series of microbursts and some artists who had broken down had problems, we left our Gravity tubes up until the very last item was packed. They did their job, allowing us to travel lightweight and having sufficient weight for events along the way.