Originally Posted By: clearwater
Since Giardia is a big concern in the US and person to person is how a lot of it is transmitted, one should be very careful if this is used by more than one person.

Are you saying getting giardia from cross-contamination is MORE of a risk with the Lifestraw than, say, some pump? Because giardia is generally not transmitted mouth-to-mouth AFAIK. It is primarily oral-fecal, so any object you share with someone could conceivably be contaminated, like a cup, not just a Lifestraw.