Tired of getting your brand new Hydroflasks dinged up? Slide on a Hydro Flask Medium Bottle Boot! Small boot that fits 32-40oz wide and standard mouth bottles made of silicone. The boot comes in a ton of colors you can swap out for different looks to accessorize you Hydroflask. Never lose yours in a crowd. Your Hydroflask will be the envy of all of your friends. BPA-Free construction.