First of all I can’t love this To-Go Buddy enough! I ordered the Northern Lights color and it is BEAUTIFUL!! I had to try it both ways so I used it as a tumbler and also got a Blender from Scooters and wow! The ice stays for SO long!! My frozen coffee usually melts within an hour or so but when it was in the To-Go Buddy the blended ice never melted! I wanted to test it and left it all day (8AM-5PM) and it still hadn’t melted! That’s a win in my book!! As for the tumbler option, this thing is awesome!! Filled it with ice water and the ice stayed for over 12 hours!! If that isn’t reason enough to grab one idk what is!