Outfit your pack with flexibility and the built-in confidence of clean and safe drinking water. Crux Reservoir Kit filtered by LifeStraw passes 2 liters of water through two complete stages of filtration - the Hollow Fiber Filter removes bacteria, parasites, and microplastics and the Activated Carbon Filter reduces taste, odor, and chlorine. Easy to fill and equipped with multiple features to ensure reliably safe and leak-proof personal hydration. Every purchase shares the gift of clean drinking water - one product, one child, one year of safe water.