Insulated Features * Insulates hot beverages up to 6 hours * Insulates iced drinks up to 24 hours * Durable, double-walled construction * High performance vacuum insulation * Slim design fits in most cup holders * Made of 18/8, food-grade stainless steel, no liner needed * 100% stainless interior (18/8 stainless caps) * Extra-wide mouth (2.125") * No BPA, phthalates, lead, or other harmful substances * Doesn't retain or impart flavors * Rounded corners are easy to clean * External, stainless steel threads * Works with standard backcountry water filters * Reusable & recyclable * Easy to hand wash * Café Cap and Flip D-Ring Cap available as accessories Available in 12, 16 and 20 oz.