Here's an interesting idea, a carbon filter in the Guyotdesigns bottle. Carbon takes out pesticides, chemicals,etc. I wonder if this will be as effective as my Katadyn combi for chemicals, could take out the filter for chemicals leaving just the steripen. Would be a great weight reduction.

http://www.guyotdesigns.com/site/htm/home.html

TapGuard makes safe water taste better by removing chlorine and other chemicals that can give tap water a bad taste.
Introducing the TapGuard from Guyot Designs. Add it to your widemouth bottle and you've got carbon-filtered water from any safe source.

# Package contains a TapGuard unit and two replacement carbon filters, enought for 200 liters of great water.

# Fits CamelbackTM, NalgeneTM,
and most wide mouth bottles.

# Save money, save the earth - replaces hundreds of disposable bottles.

# Carbon filter material made in the USA.

_________________________
Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985