It all started when our founder took a sip out of a traditional water bottle while driving his pickup down a bumpy dirt road. The lid fell on the floorboard, out of reach, and he thought, "There must be a way to prevent this." Magnets were the answer. Not only will you "never lose your lid" with our patented magnetic tether technology but we also made the best insulated water bottle you'll ever own using the power of vacuum to preserve the temperature. Choose from 12 oz, 16 oz, or 20 oz, the Sidewinder vacuum-insulated water bottle will keep beverages hot or cold for hours and are guaranteed to be leakproof!