Assuming that you never put any sports drink in it, my guess would be that either you put in some water that wasn't properly sanitized or that some bacteria got in through the mouthpiece. I have never had any trouble with mold. You could clean it carefully and put some bleach on it, or just buy a new one.
Originally Posted by
EvoFX
i have been using a camel back my whole trip across the states, till i found out that the tube got moldy.
has anyone had that problem?
i use it everyday for the last 2 months and today i just realized it has mold in the tube and a little in the pouch.
was it becuase i did not air it out? even though it was in constant use for 2 months.