In between hiking, kayaking, and snowboarding, the durableHydro Flask Wide Mouth Straw Lid lets you add sipping to your outdoor adventures. It works with all our Wide Mouth bottles and, thanks to the handy finger loop, you can clip your favorite Hydro Flask bottle to your pack for one-handed refreshment from the top of the trail to the bottom of the slopes. Please note that the Wide Mouth Straw Lid is not leak-proof.