I am in love with this design and have one in each size. The small one is perfect for hot cocoa for my son. I love that I can make tea in the morning directly in this bottle and then enjoy it in the afternoon, still hot. Other perks are they are super easy to wash, I never have to fight with the lid, I never spill when I drink like with some of my other tumblers. They designed where you drink from to perfectly fit your mouth which means I never bump my teeth or have dribbles down the cup or my mouth. I am getting rid of all my other bottles/tumblers that are for hot beverages because I never use them anymore now that I have these.