I love the travel mug !     I bought a mug last summer and the top came apart and I lost the small piece (tab) that fits in the lid to seal the cover . I call the company and asked if I could by another cover or the tab , the girl I spooke to said they don't sell parts.  I must admit I was very unhappy after paying a lot for the travel mug , that no replacement cover could be bought.  Millie