Give this a try get a big caulking gun, two large tubes of silicone caulk,two balloons, cut the tip off of the tubes and put them in a balloon fill them up till they get the size you want, tie them like you do the water balloons this should give weight and bounce, I have not tried this but in theory it should work, I take that back I did try it with some sandwich bags and it worked, so give this a try and see what happens. Jenni
