After wearing the product only twice, on the first attempt it leaked very badly which I found I could just about stop by what seemed like over tightening cap. Also the valve for drinking was very difficult to get any water out of. Two of my friends purchased the same item, but both of theirs had different valves which didn't exhibit the same behaviour. One of them did leak though, and was able to be stopped. There is also not a neat way of securing the water bladder inside the bag, just 2 bits of short string, which you have to decide the best way to use. I guess you get what you pay for, as this is very cheap compared to other brands.