Double-wall vacuum insulated BlenderBottle, for mixing supplements and smoothies, keeps drinks cold for up to 24 hours Features a 316 surgical-grade stainless steel BlenderBall Whisk that mixes when the bottle is shaken, for smooth shakes in seconds 26-ounce capacity (markings go to 18 ounces) offers plenty of room for supplements, meal replacements, or water Twist-on cap with center-mounted spout seals with a quarter-turn and is backed by a Leak-Proof Guarantee Made from high-quality BPA and phthalate-free materials; hand wash cup, dishwasher-safe lid; not for use with hot liquids