I wanted a Contigo mug with a straw for my cold drinks and I love this brand. HOWEVER, I put some soda & ice in it and it was spurting out the spout and it would not stop. I didn’t even fill it all the way and it literally was gushing out like a geyser. What a mess! I have another Contigo mug without the straw and this has never happened. It must be something to do with the carbonation pressure and the straw. So disappointed I left the non-spurting mug at home. Good for non-carbonated drinks, but I will be returning.