Purchased two of these mugs. The handles are weak and flimsy: you have to be careful not to hold on to the handle when removing the lid. I'm afraid they will break off with any force.But the worst part is that one of the mugs has NO vacuum! It's obvious because, when you pour hot coffee in, the outside of the mug heats up quickly on ONE of the mugs, while the other mug stays cool. The main reason I bought this mug was for the vacuum: a vacuum mug keeps your beverage hot/cold about 10 times longer than a mug with no vacuum.