DUAL HYDRATION SYSTEM: The hydration vest is equipped with an independent hydration bladder compartment, allowing you to drink directly through a straw. The design is sturdy and helps prevent swaying during the run. MULTIFUNCTIONAL LAYERED STORAGE DESIGN: The main compartment of the hydration vest can store clothing and first aid supplies. The hidden zippered pocket protects valuables such as mobile phones. The open front pocket allows easy access to energy supplies and sunglasses, suitable for long-distance activities. COMPREHENSIVE SAFETY AND VISIBILITY: The hydration backpack features reflective markings and stripes on both the front and back for visibility in low-light conditions. Designed for outdoor activities such as running and cycling. ERGONOMICALLY ADJUSTABLE STRUCTURE: The running vest is unisex and features adjustable shoulder straps and double chest straps to fit different body shapes. The vest helps reduce swaying and friction during running, improving comfort and stability during exercise. LIGHT WEIGHT AND BREATHABLE MATERIALS: The running pack is made of ultra-lightweight and abrasion-resistant nylon. Breathable mesh covers the back and shoulder straps to promote air circulation and quick sweat wicking, keeping the back dry and cool. Suitable for a variety of high-intensity outdoor sports. Specifications [Product Fabric]: Water-repellent fabric [Suitable Occasions]: Sports, running, travel, cycling [Product Colors]: Black, blue [Product Dimensions]: Width 22cm, Height 39cm, Thickness 5cm [Product Weight]: 0.17 kg Color: Black Material: Polyester+Nylon Package Contents: 1*Running backpack 1*1.5L water bladder Only the above package content, other products are not included.