Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the tallest mug you can put in there?
Document: This is going back to Amazon returns soon. It feels cheaply made. It starts heating the water before I press the button and even before I put water in it. The top buckles and pops up from the heat. The mug it comes with does not hold the heat very well. If I were you, find another single coffee maker.
First off it makes a great cup of coffe. However the quality of the product is not top shelf. The 'Start' Button is always on. You have to fill the coffee basket and put it in place, pour in the water and put the cup in place BEFORE you plug the unit in. Also, the lid to to the travel mug is not tight at all. You can not trust it to hold in place when full, especially with hot coffee.
Unit defective on first use. Once you put water into the reservoir, it leaks out everywhere. If something can't even survive shipping, it's definitely not worth the trouble. Don't waste your time on this one.
The brewer does what it is supposed to do with no issues. The cup on the other hand is fairly useless for anything other than measuring the water to put in it. It operates like a trick dribble glass, I'm pretty sure that wasn't the design.
This coffee maker is perfect for me because I normally only drink one cup a day. I can put the sugar and cream in the thermos, hit the button and be out the door in 5 minutes. Also, the permanent filter is a money saver.
I am buying another one to give my cousin as a gift. I love it! Sometimes the grounds are sprinkled in the well where the brewed coffee goes through, but I rinse it out and no problem, someetimes I get carried away and put too much coffee, my bad.
I've had this coffee maker for 5 months now and it absolutely is the best, I put a scoop and 1/2 of coffee and it's good to go.. It's also good for just making hot water for hot chocolate, oatmeal and tea... would advise my friends  to purchase this product...
I received it last week from Amazon and have used it daily since. There's nothing wrong that I can see. Put the coffee in, fill with water, press the button, and walk away. It's not piping hot, but it's hot enough. I put half n half and sugar in the 16 oz. cup that comes with it. I have a 17 oz.
Threw out my expensive name brand single cup maker because frankly it was just too large and the quality of the coffee had diminished even after cleaning regularly with vinegar (we have hard water). Got this little gem and so glad I did! It is super easy just pour a cup of water in, put the grounds in the filter provided (I am not using paper filters as the filter that comes with it works just great!)
I've been using this coffeemaker for almost a year. It makes a great cup of coffee, which tastes as good (to me) as the ones from a k-cup. My brother is a long-time k-cup user and even he agrees. And it's so much more economical. I grind my own beans, put 3 tablespoons of ground coffee in the filter basket, and add water to the line. It's hard to go wrong.
Answer: I just measured...it comes with a mug that is 7" tall (mug holds 16 oz).