Many years ago a visiting coworker left his Contigo behind at plant, my husband started using it and we fell in love with it. We have several now in different sizes but with the leakproof push button lock, so easy to clean we take them everywhere with us, on plane, motorcycle, hiking, grandkids sports games and cold ice water on headboard of bed husband drinks a lot. We don’t like anything with straws because it’s harder to keep clean and mold free, so thank you for keeping these available always we won’t use anything else!!!