TRAVEL FLASK: Secure, flip locking lid system makes this flask ideal for bags, car doors and cup holders. UNBREAKABLE, LEAKPROOF DESIGN: Made from robust 18/10 stainless steel with an airtight lid, the flask is 100% leakproof. VACUUM INSULATED: Double walled vacuum insulation keeps drinks hot for up to 8 hours, and ice cold for up to 24 hours. ECO-FRIENDLY: Help save the planet one sip at a time by purchasing a reusable travel flask and cutting down on disposable coffee cups BPA, Toxin and Phthalate Free, imparting no unwanted flavour into your drink. Dishwasher safe.