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Title: A tip for you/
Review: When you use the K.K. fight your natural instinct to tighten the sports cap on as tight as you can. If you do, you will get an annoying whistling noise everytime you take a drink. Instead, keep it tight while not drinking from it and loosen it to the point where it will no longer whistle when you do drink. It has to be pretty loose, but it has not leaked water on me yet. Remember to retighten it when you're done drinking from it.
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