1. Most cars do not have cup holders that fit this thermos. The bottom diameter of the thermos is 8 cm. The height of the thermos is 33 cm. It is large enough to hold coffee, tea, and hot water when traveling, at home, or in the office. The total capacity is 1 liter. Please be sure to check the size and capacity before purchasing. 2. Please be aware that this vacuum flask is larger than you might think. Most vacuum flasks on the market are 2.4 dl or 4.7 dl, while ours is 1 liter. Do you want to keep your hot coffee or iced drink hot or cold for hours? Then look no further. Our insulated bottles hold up to 1 liter. It's a larger size whether you're traveling with a coffee thermos or storing hot water. 3. Our insulated bottles come with an easy-to-screw lid that prevents leaks, see image 4. The screw cap on the lid must be tightened properly (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 keeps hot drinks hot for 6 hours and cold drinks cold for 12 hours. Make sure the lid is properly 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.