The BlenderBottle SportMixer™ 28 oz. Bottle is great for water, flavored drink mixes, electrolyte/supplement mixes, energy drinks, meal replacements, nutritional supplements, protein powders, smoothies, shakes, fiber powders and more and includes a 316 surgical-grade stainless-steel BlenderBall® for mixing ingredients. The leakproof bottle is BPA and phthalate free and features a StayOpen™ flip cap.