This Zak Designs tumbler holds 40 ounces, and is vacuum insulated to keep its contents the perfect temperature for hours: cold drinks stay cold, hot drinks stay hot, and condensation won't form on the outside of the tumbler. It has a slide lid, to help prevent splashes and spills, which can fit a straw (recommended for cold drinks) for easy access. The side handle helps with grip, and the bottom of the travel tumbler is tapered so it fits into most car cup holders. The stainless steel material is durable enough for everyday use as well as completely BPA free. Hand washing is recommended to preserve the vacuum seal; do not microwave.