After losing and replacing several way more expensive cup brands for my two boys, we tried these. I wish we had known about these from the get-go! These are so inexpensive that if we misplace them, it doesn't bother me at all. They don't leak, and I love that they are different colors, so we can tell their cups apart very easily. I have recommended these to several people (especially for daycare cups!) We will continue to repurchase!