3L Portable Hydration Bladder with Self-Locking Valve for Sports, Hiking, Camping, and Climbing Blue and Black Product structure: Portable water bag with integrated design and high-performance waterproof construction. Features a secure gasket on the lid to prevent leaks, even under pressure. Resistant to deformation and aging. Includes a high-quality PVC drinking water hose, 100 cm in length. Each unit is rigorously tested and can be installed at room temperature. Not intended for use with hot liquids or non-water beverages. High Capacity: 3-liter hydration capacity meets daily hydration needs. Wide opening for easy filling and cleaning. Ergonomic handle provides comfortable grip. Water inlet cover helps prevent spills. High-Quality Material: Durable PVC drinking water tube compatible with backpack hydration systems. Translucent reservoir with printed volume scale for easy measurement. Integrated loop for secure attachment to backpacks. Foldable design allows for compact storage and convenient portability. Features: Large bladder opening with 100mm inner diameter enables easy ice cube insertion, thorough internal cleaning, and simple inversion for maintenance. Designed for reliable hydration during outdoor activities.