Hey SuperDave!



My brand of camel back had a metal zipper. Just ONCE I was slow to rinse it with fresh water and it jammed with salt and corrosion and the little slide ripped apart, effectively killing the bag.



I also recommend trying out several models full of water with your PFD. I had to try a few to get a setup that fit right and didn't hang up on my PFD straps and trap harness. I had to add a line to keep the shoulder strap from sliding down.



It was trouble but I loved it while it lasted.