Stainless steel spill-proof BlenderBottle for mixing supplements and smoothies features an easy-open/easy-close push-button flip cap with a sliding lock to prevent accidental opening24-ounce capacity (interior markings go to 20 ounces) offers plenty of room for supplements meal replacements or waterIncludes a 316 surgical-grade stainless steel BlenderBall Whisk that mixes when the bottle is shaken for smooth shakes in secondsDouble-wall vacuum insulation keeps drinks cold for up to 24 hours; flexible ergonomic carry loop provides a comfortable holdMade from high-quality BPA and phthalate-free materials; hand wash cup dishwasher-safe lid; not for use with hot liquids