This clever little device fits into the opening of the popular, Nalgene 32 oz., widemouth bottle, making it easier to drink without spilling water all over yourself, even while walking. The SplashGuard can be easily removed to fill or clean your Nalgene bottle. You can even fill your bottle with the SplashGuard still in place if you prefer. It is dishwasher safe and weighs only 1 oz.!