Quote:
Would it be possible to have some of these hydration bag makers make the opening wide enough to just stick the Adventurer Steripen directly into the bladder? I'm not talking the wide zip Platy but the 1 and 2 liters have the narrow openings and the pen doesn't fit. I have to carry another liter bottle or bladder with a wide opening to treat the water, then pour into the bladder.


That's a problem in the Adventurer design. The original Steripen seals perfectly on the Platypus- so you can inverte and swish.

That being said, I still use a 1L Nalgene Canteen- so I can use the prefilter.