1、Most cars don't have cup holders that will fit this thermos. The bottom diameter of the thermos is 3.15 inches. The height of the thermos is 13 inches. It is large enough to hold coffee, tea and hot water when you are travelling, at home or in the office. The total capacity is 34 ounces. Be sure to check the size and capacity before purchasing. 2、Please make sure you know that this vacuum flask is larger than you think. Most vacuum flasks on the market are 8 ounces or 16 ounces, while ours is 34 ounces. Want to keep your hot coffee or iced drink for hours? Look no further. Our insulated flasks hold up to 34 ounces. It's a larger size whether you're travelling with a coffee thermos or keeping hot water. 3、Our insulated flasks come with an easy screw-on lid that prevents leaks, see Figure 4.The screw cap on the lid needs to be securely tightened (screwed on) clockwise. Otherwise, the lid will leak and the vacuum flask will not be able to keep liquids hot or cold. 4、The thermos bottle will keep hot drinks hot for 6 hours and cold drinks cool for 12 hours. Make sure the lid is tightened. Thermos bottles are made of stainless steel with double vacuum insulation. 5、The stainless steel water bottle is dishwasher safe. It is recommended to hand wash the vacuum sealed water bottle.