I'm still waiting for the perfect technology. Many new items improve on most aspects of a predecesor, but often introduce a new problem. Widespread use of automobiles eliminated piles of horse manure and related public health problems. Introduced different forms of polution and dependence on foreign oil <img src="/images/graemlins/frown.gif" alt="" />

Hydration systems are better than canteens or bottles in lots of ways. One drawback not mentioned thus far is knowning how much liquid one has consumed. While the ease of drinking tends to increase consumption, because the bladder is hidden away, out of sight, there's not a lot of feedback as to the actual volume consumed. (Of course, until you suck and nothing comes out <img src="/images/graemlins/grin.gif" alt="" /> )

This is a particular challenge for those going into a new environment, e.g., from sea level to the mountains of NE New Mexico. Plan to drink more, but how to know when you're on plan?

/Neal