It is a beautiful, heavy product that appears to be well-made. However, while it keeps cold drinks with ice cubes or without them for a decent amount of time, it leaks. This specific product, because it is a cup and has a compartment for a straw, leaks from everywhere. It needs to stay upright because if you put it in a bag, even if you have closed the opening where the straw goes, it will leak. Despite this, it is a decent thermos that keeps cold drinks cold, especially if you have added ice, and it also keeps hot drinks hot for a considerable amount of time. The external temperature plays a significant role because if it is 45 degrees Celsius outside, do not expect it to keep your drink cold for four hours