Twist it, sip it, save it. The new Twist Cap with built-in straw fits all TKWide bottles. Twist open the straw spout to quench your thirst or snap it closed for a completely leakproof lid. The Twist Cap is a dream come true for Klean fans who want both a reusable straw and a leakproof cap. Who says you can’t have it all? Twist Cap is also equipped with new TK Closure™ internal thread design and an easy-swivel loop. Compatible with TKWide Klean Kanteen bottles only. Not recommended for very hot liquids due to steel straw.