High-quality material: The jogging hydration pack is made of ultra-light, scratch-resistant nylon fabric and weighs only 340 grams! Ergonomically designed, it adapts perfectly to the curvature of the body, reducing air resistance as much as possible and maintaining optimal body condition. The lightweight running backpack is equipped with clear reflective strips that are very bright in any light at night and can ensure the safety of night sports. Three-dimensionally breathable: The back of the jogging hydration pack is made of breathable mesh padding to provide additional support for the shoulders and reduce back friction. The shoulder straps are very wide, which greatly distributes the weight of the backpack. The chest strap and hip belt secure the backpack to prevent shivering. The back is covered with a breathable mesh that can quickly dissipate heat, maximizing breathability and comfort. High-quality 2L water bag: The jogging backpack is made of high-quality TPU material, which resists pressure and prevents leakage. The opening design is convenient for cleaning and adding ice cubes. Gently pull the straw upwards, bite the top of the straw, and the water will flow into your mouth. You can attach the straw to the clip on the backpack's shoulder strap, so you can remove the straw to drink at any time during exercise. Large storage space: The women's hydration backpack has a large storage space with enough pockets to meet all your storage needs. The large U-shaped zipper allows you to easily place or remove items, and a mesh pocket allows you to store small items. The outer layer is made of waterproof material to prevent items from getting wet. (Do not expose the backpack to rain, as its back is not waterproof.) Best sports equipment: With this men's jogging backpack, you can replenish your hydration at any time while cycling, running, climbing, or other outdoor activities. This running backpack with a 2L hydration bladder is your faithful sports companion. All Faneam products have undergone rigorous quality testing. In case of quality issues, you can request an unconditional refund directly.