"Ronin",

You answered your own question as to why I carry chlorine dioxide tabs W/ my SteriPen. As you said, there have been reports of SteriPen Adventurer failures in the field. As I did state in my post, I carry the Micropur tabs as a backup & to purify my hydration bag every few days to kill any lurking cooties.

Eric
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"There are no comfortable backpacks. Some are just less uncomfortable than others."