Nick, this looks like it has been replaced. Is your bladder of rubber Neoprene or plastic. I am not able to tell by the picture. The black dots may be some form of rust or breakdown of the material. If you do not see any actual holes then it is still OK but more than likely that will be they fail spot in the future. I was looking online and found some 1/64 Rubber Neoprene sheets that will work, about $15 bucks including shipping. I think I will order some and see for my self. If you check it out don’t buy it I will give you some if it works, there is way more than what I would ever need.