It comes with two separate straws that can be cut to fit your Wide Mouth Hydro Flasks and has a convenient finger loop so you can clip your bottle while on the go. The Straw Lid is top-rack dishwasher safe and is backed by our lifetime warranty. Like all Hydro Flask products, the Straw Lid is both BPA- and toxin-free. The Straw Lid fits the wide 18 oz, 32 oz, 40 oz and 64 oz Wide Mouth Hydro Flasks. Please note that the Hydro Straw lid does not fit on the older style Wide Mouth flasks. To find out which style flask you have and whether the Hydro Straw Lid will fit yours, check out the Wide Mouth Fit Guide. * Please note that the Wide Mouth Straw Lid is not leak proof.