I have actually bought 4 of these bottles. The first one was stole at the gym. Then I bought the second one. I just purchased two more of these. One for my Mom and a spare just in case. I see that most of the people who review this product say that the spout leaks. Well that was the case with the first one, but I quickly figured out that you have to pull up the spout very hard the first few times. This will "lock" the spout in position, and it will NOT leak when you drink from it. The bottles are 35 oz. not the 28 oz. they have listed. They are about 3.75" at the bottom. I have found them to be extremely tough and long lasting. I use one at home all the time and one at the office. I have taken them to the gym, and have no problems with it fitting in a cup holder, but on occasion when it doesn't fit, I will close the top and set it on the floor next to me.
I highly recommend this water bottle!!!