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Amanda L. Fantastic for both hot and cold drinks. Sturdy and holds up to everyday use. Great travel tumbler as well!
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Dennis J. Purchased a flex shaker for my wife. She absolutely loves it. Easy to open and close. Keeps her coffee hot in the morning and her water cold in the afternoon. Nine Lines customer service was phenomenal.
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Stacy H. This flex shaker is one of the best cups I own. Early in the morning I carry my protein shake, once I drink it, I fill it up with hot coffee. Keeps my drinks cold and hot for hours, this is my go to in the early AM for work. I love that I can switch from a straw to a regular coffee travel cup.