Got it for my 24 oz. Hydroflask. I wake up all the time throughout the night and drink water, so I wanted a cap that didn’t involve unscrewing. Worked great at first. Washed it (removed the straw) and when I put it back on, couldn’t pull any water through and it made a whistling noise. Contacted customer service, they responded within half an hour and shipped me a new one for free. Awesome dudes.
Review by on March 3, 2016