I received my KeepCup in a PopSugar Must Have box and I use it almost every day in place of disposable paper or Styrofoam cups to feed my coffee addiction. The lid is securely attached and I haven't had any problems with leaks. I really like that you can disassemble the lid parts to wash it better. The cup is made from glass, so it gets pretty hot when filled with coffee, but the rubber band keeps your fingers from burning. This was a great eco-friendly find!