The TKWide Loop Chug Cap is a leak-proof bottle cap from the brand Klean Kanteen, suitable for all Klean Kanteen TKWide bottles. The complete insulation of this bottle cap enhances the thermal qualities of the TKWide bottle. The TKWide Loop Chug Cap, shaped like a flask, features an additional bottle cap on the spout that ensures 100% leak-proof when properly closed. A loop keeps the secondary bottle cap secure while drinking. The TKWide Loop Chug Cap made of polypropylene contains no toxic substances, is BPA-free, and equipped with TK Closure technology to provide optimal insulation and maintain cold and hot beverages.