Protein powders & pills, supplements, travel items & more. Go With It: Grab it, fill it, go with it. GoStaks are a smart and sleek advancement in portable nutrition. Durable jars secure tightly to carry powders, vitamins, supplements, snacks, and more. www.blenderbottle.com. BPA free. Twist n' Lock system. Removable carry handle. Secure seal for worry-free portability. Durable Eastman Tritan material resists stains & odors. Fits inside your BlenderBottle. Mix and match sizes to fit your needs. Starter Pack: 150 cc, 100 cc, 60 cc, & 40 cc jars. Twist n' Lock system connects jars with ease. Designed in the USA. Made in China.