Ok, this may be a bit goofy. But I love my water bottle. It is a hydroflask and it keeps my water nice and cold. I have left ice cubes in overnight and I will wake up and the water will still be cold. I do need to put in a dozen or so decent sized ice cubes but that's ok. In a ballet class, you need a good water bottle. There is no way around it. The ballet studio is as hot as a sauna. No joke. So you need a good water bottle. Mine keeps to water ice cold and I love it. It's beautifully cold and I love it. You always have to bring a water bottle with you to ballet. Studios that don't allow water bottles, I do not get that. Do you want for your students to die from dehydration? Anyway, have a great day and just keep dancing!! ~Mia