The included straw is cut to fit our tallest Eco Vessel bottle. A ruler is included with the names and sizes of Eco Vessel bottles clearly marked, so you can easily find your model and use scissors to cut the length you need. We suggest you err on the side of cutting a little longer, as you can always trim more, if needed. Fits: Aqua Vessel, Bigfoot, Boss growler, Boulder 32 oz, Boulder 24 oz, Boulder 20 oz, Summit 24 oz, Summit 17 oz, Ultra Lite, Wave   *Disclaimer: These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.