DUAL HYDRATION SYSTEM: Running vests are equipped with an independent hydration bladder compartment, allowing you to drink directly through a straw. The design is sturdy and helps reduce swaying during activity. 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, and the open front pocket makes it easy to quickly access energy supplies and sunglasses, accommodating the needs of long-distance sports. SAFETY AND VISIBILITY: The hydration backpack features reflective markings and stripes on both the front and back, improving visibility at night or in low-light conditions. The running vest is designed for outdoor activities such as running and cycling. ERGONOMICALLY ADJUSTABLE STRUCTURE: The running bag features adjustable shoulder straps and double chest straps to fit different body shapes. The hydration vest reduces swaying and friction during running, improving comfort and stability during exercise. LIGHTWEIGHT AND BREATHABLE MATERIALS: The running pack is made of lightweight and abrasion-resistant nylon, with breathable mesh covering the back and shoulder straps to promote air circulation and moisture management. The hydration vest is suitable for a variety of 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.