Until now, I've often bought hot drinks from convenience stores or vending machines when I go out, but with the recent rise in prices, I've become more conscious of saving money, and so I bought this product. Depending on how often you open the lid, you can put in a hot drink in the morning and enjoy it warm until at least lunchtime. It's also very convenient that you can open and close it with one hand, and it also has a stopper that clicks into place to prevent the contents from leaking out if it opens by itself in your bag or something. The seal part has as few parts as possible, so it has a simple structure that's easy to wash. The price isn't that expensive, so if you make cheap hot drinks at home and carry them around in it, you'll soon get your money's worth. It's an essential item for saving money.