Our ThermoFlask® Straw Lid allows you easy, one-handed access with the flick of your thumb. It comes with a straw that can be cut to fit any wide mouth bottle size, and the stainless steel pin in the handle makes this lid nearly indestructible . Folding straw is leakproof when closed securely. This lid fits all ThermoFlask® Insulated Bottles from 18oz to 64oz. Also fits 14oz and 16oz Kids Bottles. DOES NOT FIT ThermoFlask® 17oz Travel Mugs.