It's time to replace my camelbak bladder, which has developed a small leak. One thing that has always frustrated me with it though is how hard it is to dry out. I decided to invent the reversible water bladder to solve this - only to learn that hydrapak beat me to it! Has anyone tried the hydrapak? It seems to be marketed mostly to cyclers and only sold in cycle shops. Is it good for backpacking? Is it a good product in general?