Customers now have an additional cap option for their Wide Mouth Hydro Flasks.The new Hydro Flask Straw Lid is an easy to use flip straw designed with a high flow rate and a durable rubber coating to withstand bite marks. 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.Straw Cut Guide: Remove 2.5' off the straw on the 18 oz wide, 1.5' on the 32 oz, just a hair on the 40 oz, and one inch off for the 64 oz.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.