HighlightsPractical & Innovative Water Bladder - This hydration backpack has a large opening for effortless filling and cleaning. It features an automatic shut-on/off valve to avoid leakage, a 360° mouthpiece with a dust-proof cap to maintain hygiene, an ergonomic handle design for convenience and functionality. Experience a seamless and convenient drinking experience.3L Practical Water Bladder - The hiking backpack with hydration bladder includes a food-grade TPU water bladder, ensuring a pleas