The rubber has stunk for days because you do not want to know what's in there. Have you multiple hot filled and left lying somewhere to ventilate, to bed, you can not take the smell at the beginning. I bought this from the same company a smaller Kinderwärmflasche that stank not, fortunately. But why be omitted a few toxins only when the children ??? Filling goes well, lasts a long time is warm and the outside nice and comfortable. Cover can be removed. Because of the severe and long-lasting odor 2 star deduction, otherwise satisfied.