Product Size: Backpack is 29cm long and 41cm high. Water bladder: 351*175mm. Color: Gray, Black Gray, Gray Red. Material: Nylon. Package Contents: 1 x Outdoor Sports Backpack, 1 x Outdoor Sports Water Bladder. 1. COMFORT FOR YOU: Ergonomic design, adjustable waist and chest straps for women, men, and children. Chest straps prevent bouncing while moving. Perfect for hiking, running, marathons, cycling, travel, etc. Hydration backpack is also a great cycling companion. 2. HIGH-QUALITY MATERIALS: Lightweight and waterproof high-density nylon, ripstop construction, high-quality buckle, comfortable fit – it won't weigh you down during sports. EVA foam padded back and shoulder straps with ventilation channel, quick-drying material for maximum breathability and comfort. 3. Hydration Running Backpack: Bladder compartment with hanging system, compatible with 2L hydration bladder, FDA compliant. Extra-large cap allows easy water filling. Removable tube makes cleaning simple – just rinse, empty, and invert. 4. Perfect Outdoor Gear: Lightweight jogging backpack, uniquely designed for optimal comfort and freedom of movement. Reflective elements ensure visibility even in low-light conditions. The women's running backpack features an insulated pocket that keeps your drink warm or cold for hours. 5. LIGHTWEIGHT, SPLASH-PROOF & DURABLE: Perfect outdoor sports equipment, made of lightweight and water-repellent nylon, padded shoulder straps, comfortable for long-distance running, hiking, cycling.