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      From mountain trails to morning yoga class, Hydro Flasks Standard Mouth Insulated Sport Cap lets you hydrate one-handed and on the fly. It’s the first insulated sport cap specifically designed to keep water in your Hydro Flask bottle ice cold, sip after sip.

      21oz / 621ml Standard Mouth w/ Flex Cap
      24oz / 710ml Standard Mouth w/ Flex Cap
      18oz / 532ml Standard Mouth w/ Flex Cap
      Flex Boot - Small

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