Katadyn's BEFREE GRAVITY is an innovative 3-liter water bottle with an innovative filtration system that eliminates bacteria, protozoa, and sediment. Perfect for purified hydration on treks and expeditions.

This model has a wide opening for easy filling, a protective cover and a flexible valve, making it easier to quench your thirst during exercise.
To add to its many advantageous features, it is aesthetically pleasing, BPA and PVC free, sturdy and compact.

So the BEFREE GRAVITY is a near perfect water bottle!