I saw that discussed on BT and I was amazed at how down on it everyone was. I think it's a good idea and I'm really curious to see how it works out.

This is a good video of how the refill thing works:
http://www.hydrapouch.com/cupfree/

I think that if you carry a flask, then you could fill the flask and the hydro pouch and use one for your head and one to drink...but what do I know, I've only ever raced a 5K.