:dancing: I am working on a new product idea which is a little device that would let you know at all times how much fluid you have left in your hydration pack. It does other things but that is its main function. I would love to get some feedback from hydration pack users or anyone that has an opinion on this idea. What do you think? If there is a better place to post this question will someone let me know? I am new to this forum and would like to do it right! Thanks R.J.