This thing is so hard to figure out I did not study it intently.  It may actually be waterproof and well made, but it strikes me as something well meaning folks would buy as a gift not realizing how unwieldy it is.  There are not a lot of great waterproof fanny packs on the market and it is something important.  When you do find one, make sure the waist clasp that locks the belt together is not cheap and subject to opening.  Seattle Sports for example uses very cheap clasps.  I also suggest always using a zip lock bag to hold the contents of the case in case it leaks.  A ziplock bag may save you in the event of a slow little leak.  To give a better idea of how useless this product seems to me,  if you ever have anyone walk the plank on your boat,  give them one of these cause I don't expect it will do them much good.