Absolutely useless. I'm so angry I spent my money on this thing. I took it with me on trips abroad, knowing I would be visiting areas where clean water could be an issue. When I got back from the trip it was too late to go back. I understand that the water has to go through a rigorous filtering process and therefore the flow of water through the straw can be reduced. But no matter how hard I sucked on that stupid thing, I could barely get any water out. I've tried gently biting the tip like you're making an inflatable valve, I've tried holding it upside down, right side up, scrubbing it, shaking it, the living daylight out of my damn 50 dollar bottle to suck! Long story short, I ended up carrying this space junk with me on a month-long trip, never using it, and spending a fortune on bottled water while I was away. But then again, I think if you're looking for a giant Uber filter dripper, this might come in handy! Don't waste money.
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