【Multiple Compatibility】 The lid is perfectly compatible with the 18/21/24 oz Hydro Flask standard mouth ... this water bottle cap is the perfect accessory to keep your drink at hand at ...

Related: The 50 Best Amazon Deals That Are Just for Prime Members This Month — Up to 70% Off This option comes with the Hydro Flask Chug Cap, a great pick for taking on runs and rides because of ...

You can't go wrong with any Hydro Flask bottle (and they are our absolute favorites for keeping drinks ice cold), but the 24-oz Standard Mouth with the Flex Straw cap checks a lot of boxes.