- Constructed from durable, water-resistant 600D Oxford fabric, this bike hydration backpack is tear and abrasion-resistant, ensuring long-lasting use. Dimensions: 7.1 x 2.8 x 16.9 inches. - Features an adjustable chest strap, waist belt, and shoulder straps designed ergonomically to fit your body. All straps are customizable to minimize bounce, providing a stable fit even in rough conditions. The soft air mesh back enhances airflow, keeping you cool while the foam-padded shoulder straps offer exceptional comfort. - Equipped with a double guarantee to prevent leaks, including a switch valve and cover cap. The hands-free hydration tube with a bite valve allows for easy sipping; simply bite to open the flow. The wide screw cap facilitates easy filling and lets you add ice cubes to keep your drink cold. An emergency whistle buckle adds an extra layer of safety. - The hydration bladder is made from high-quality TPU material and has successfully passed rigorous testing, including pneumatic pressure, swing, and vibration tests. The large opening simplifies cleaning and adding ice. The 135-degree rotating mouthpiece allows for effortless drinking. Use scenarios: 1. Ideal for cycling, ensuring you stay hydrated while navigating tough terrains. 2. Perfect for hiking, providing easy access to water without needing to stop your adventure. 3. Great for outdoor sports, allowing hands-free hydration during intense activities.