based on the research that i have done, people were better off without the life-preservers. the reason: the material that was on the inside of them, would obsorb water after so long, making them sink! just a little known fact for ya. if you don't beleive this, give me a site where it says other wise and i'll admit my mistake. but i did find this on a credited site; just don't remember which one it was, i do a lot of research.