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.
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.
I really like this tumbler. My favorite features are that It's large but slender and keeps my drink cool and it has an easy twist turn lid.
We've never owned anything close to this good! It's gorgeous, it works so good and I'm glad we got it! I'd order one in every color and style!!