Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: does the lid close or is it an open hole for drinking? Also wouldl ike to confrim if the inside is plastic?
Document: I was a tad disappointed in the ability of this mug to keep my coffee warm. I pour it, drive 1 hour, and then start drinking it. It is much cooler than the other Thermos brand travel mug I've used for years. Also, I don't see how its a ruggedized &#34;work series.&#34;  The handle is plastic, and so it the top.
There is no way to prevent a leak unless its always in the upright position!!! for a thermos with a tight closing lid, this is the worst idea that I have seen in such an otherwise very nice product. what I am referring too is this small piece of rubber that you push one way to drink and another way to close (when not drinking) on top of the lid.
nice looking coffee mug it just dose not live up to my standards of a coffee cup. the inside is plastic and it makes my coffee taste like plastic. a good coffee cup should be stainless steal. this one just sits in my storage I am going to throw it away the only good thing is that it dose not leak.
This is a good looking, heavyweight mug. It keeps coffee hot for about 2 hours. My only complaints are that it is too narrow to get my hand down inside to wash it really well and the plastic inside retains odors. I think it would be better if the inside was metal(stainless) like the outside. It does fit the cupholders in my car but is a bit top heavy.
This mug is heavy and doesn't keep my coffee hot longer than the cheap ones I have bought. This was a waste. The only good thing I can say is it is very sturdy. It is easy to open to drink and then close.
They wash great with a bottle washer for the narrow bottom. There is room for a tall, flexible straw if you are drinking ice tea. They fit in my car holder perfect. My only wish is that they came in black, red, royal or breast cancer pink. It would also be nice to have one a little larger mug for my ice water, but overall I am extremely satisfied. I would definitely recommend this product.
I told my sister this is what I wanted for Christmas as a gift. I just started drinking coffee and liked to take it with me to work. It's a big cup and it insulates well. Holds hot coffee hot for about 25 min and keeps it warm for almost an hour if it's full, less if its half gone or very cold outside. The lid can be put on in two ways, so that the drinking opening can be used with right or left handed drinkers.
To me, this mug/cup doesn't live up to the "Thermos" brand reputation.The lid isn't leak proof. Leak resistant..sure. If the cup is tilted, liquid does leak out slowly.Hot Coffee only stays HOT for only about 15 minutes. It stays warm about 15 more. I think the flaw in the design in the plastic liner. While it is easy to clean, it just doesn't hold the heat in.
I was looking for something that would keep coffee hot until lunch (3-4 hours). This mug only keeps coffee hot for about 1-1/2 to 2 hours. You have to (by hand) screw the top on tightly or else it dribbles. The lid and interior are plastic; maybe metal would work better? I expected more from a Thermos product.
This travel mug matches my thermos and is a very nice looking and sturdy mug. It holds a lot of coffee and keeps it warm for quite a while. The only bad thing I have discovered is that the lid will slowly move the more often it is used. The hole to drink out of has moved about 2 inches to the left since I started using it. Other than that it is a sturdy mug that will take a lot of abuse.
Answer: there is a slide that slides over the hole to drink out of but it is not leak proof. One slight tilt and your beverage leaks all over. Yes, the inside is plastic. I was extremely dissapointed that a Thermos product was not leak proof. I dont recomend the product