Tervis, 24 oz (large), New/Never Used The original double-walled insulated classic line is perfect for keeping your cold drinks cold and your hot drinks hot. With thousands of design options available, our BPA-free plastic insulated tumblers, water bottles and mugs make hydration and personal expression easy. Tervis is the best brand for keeping drinks warm or cold, while also being leakproof. I’m still using one that is about 15 years old and is great condition!