I bought this one and two other insulated mugs. I hand washed and dried them and was excited to use them the next day. I went to use my Keurig with the 12oz insulated travel mug and noticed that when it was filling with coffee, bubbles were coming out of the bottom of the mug. I thought that seemed kind of weird out of a brand new cup, so I poured the fresh coffee into another cup and tried with regular cold water, and it still leaked out of the bottom.