Hydro Flask Wide Mouth Flex Straw Cap

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The whistle cover/cap is tight and not fake. A really good purchase!

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The boy refuses to use anything else

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Good addition to the bottle, waterproof

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A good addition to Hydro Flask Wide pickup bottles. Waterproof and easy to drink and clean.

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A pleasant cap with a straw. A plus for the movable carrying handle, previously only a fixed one-finger handle with a whistle was available.

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Worth buying if you own a HydroFlask bottle...

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Fits well in the bottle and doesn't leak, which is the most important thing. The water does not start to taste like plastic, as in many similar products. Good product.

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An excellent cap that does not falsify and keeps the water cold for a long time. It's a shame I didn't buy this add-on earlier, because now the hydro flask is used more often.