+1, these help ward off cramps for me too. I leave a few in the backpack in case I get a cramp although at time out on a trail it is a bit late anyhow :|For cramps, try magnesium tablets. I went onto them daily and cramps disappeared.
So what's with the freezer thing?
Is it to kill any bacterias?....or to cool it down for cold water trailside ?
Great idea. Never thought of that.hygiene
Will probably test one of the ebay bladders out.