The lid is made of poor quality plastic and is difficult to clean. Another thing that is not mentioned (intentionally?) is that you don't simply lift the cap to drink, but you have to twist it (!!!), making it impractical for a young child, plus you have to touch all your fingers on the cap (to twist it) and then drink, meaning all the bacteria go straight into your mouth. I chose this particular one because I had to return a stainless steel one that broke before my child even had a chance to use it, I don't know which one is worse. I definitely would not choose this company again. Also, I should add that my friend from Germany bought it for about 10€ while I paid about 25€