Sip while you work, travel or play with the Hydro Flask(R) Wide-Mouth Flex Straw Lid. No need to unscrew the cap to drink, this cap delivers a high flow rate and the easy to use flip top spout snaps closed when you're not using it. The new Flex Strap makes your bottle easy to take with you when you are on-the-go, providing comfortable and worry-free carrying with the leak-proof design. DESIGN Flip top spout snaps closed when not in use Flex strap for easy transportation BPA and phthalate-free Suitable for use with all Hydro Flask Wide Mouth bottles Leak-proof design Additional Details Manufacturer's lifetime warranty Model: WSFZ