Next, look at the insulation. Double-lined cups are generally better at keeping temperatures stable, but triple-lined cups offer even more insulation. Some cups also have vacuum-sealed technology, which can keep drinks hot or cold for up to 12 hours.

Size is also important. If you need something portable, a smaller cup might be the way to go, but if you're looking for something to keep at your desk, a larger cup might be more practical. Consider the mouth size too - a wider mouth might be easier to drink out of, but a smaller mouth might be more spill-proof.

Finally, think about the features you want. Do you want a handle or a strap for easy carrying? Do you need a flip-top lid or a screw-on lid? Are you looking for a cup with a built-in infuser or filter for tea or coffee? Make a list of the features you want and choose the cup that meets your needs.