I love this water bottle! In my quest to drink a gallon of water throughout the day, I purchased a water bottle like this several months ago. While I loved the concept, that bottle leaked when knocked over (not that it's easy to knock over a gallon water bottle, but I'm a klutz...). This bottle doesn't spill when knocked over. Further, the [removable] rubber piece on the bottom helps prevent the bottle from skidding/slipping over.