If you are looking to purchase a tumbler cup with a straw for your kids there are a couple of things to keep in mind. First it needs to be able to handle repeated washes in the dishwasher without fading the character that is painted on it. The cup needs to be kid safe and your child should be able to drink out of it at any angle.
The lid needs to be leak proof, naturally and ideally should have a weighted down straw. This will let them drink however they like even if they are tilting their head to the side. I also suggest finding a good quality cup with a solid lid. That sounds obvious, but some plastics are flimsy and break off. That’s not good.
Check reviews before you buy a cup online. I advise buying online because of being able to read the cup’s reviews. This saves time and trouble and you can see if others have had problems with some of the things mentioned above.