Standard Mouth Flex Straw Cap Black

The Standard Mouth Flex Straw Cap Black is a waterproof stopper with a built-in straw, designed to fit onto your regular-neck Hydroflask bottle.

Thanks to its construction isolante, it guarantees excellent thermal insulation and makes it easy to keep your water cool all day long. Please note: this type of stopper with an integrated straw is not suitable for warm drinks.