mine are expensive...first i go and take one of those skydivin classes...but instead of jumpin, i steal 3 of the parachutes. then i take those to sumone that knows how to sew, they usually charge me 150-200 to get tha 3 parachutes sewn together. then i go to seaworld and put shamu on the parachutes and hang them on a crane to see if they could hold the wait...that cost a good grand. once i see if they can hold shamu, i make them fill it up wit water to see if it can handle the splash. if it holds...i take that and put it in my wallet for later....