BlenderBottle SportMixer Twist Cap Tritan Grip Shaker Bottle, 20-Ounce, White Price: $11.99 (as of 01/14/2022 07:07 PST- Details)

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20-ounce capacity (note: measurements only go to 17 ounces) shaker cup for mixing protein shakes, smoothies, and supplements
Patented mixing system uses 316 surgical-grade stainless steel BlenderBall wire whisk found only in BlenderBottle brand shaker bottles