Thermoses by Ello. Details:The Ello Port 40oz vacuum insulated stainless steel tumbler celebrates the convenience of large capacity hydration with on-the-go features. Vacuum insulated stainless steel keeps cold all day and is made for all-day hydration with fewer refills! Carry the tumbler from the built-in carry loop or integrated side handle and drink with or without the straw. The narrow base design allows the tumbler to fit into most car cup holders making it perfect for on-the-go. The leak-proof lid screws on to fit accomodate both left-handed and right-handed users. Port's large capacity and easy use on the go makes it perfect for work, school, workouts, home, and everything in between!