Using this CamelBak hydration pack is a breeze. First, fill the 1.5 - liter reservoir with water. The Crux system's ergonomic handle makes it easy to refill. When you're ready to drink, just take a sip from the tube. The on/off lever can be used to prevent water from leaking. When you're biking, adjust the straps so the pack fits your torso, which should be between 30 - 40 cm. If you need to carry extra layers or a rain shell, use the stretch overflow storage compartment. The safety whistle on the sternum strap can be used to get attention if needed. For maintenance, after each use, empty the reservoir and let it dry completely. Wash the pack with mild soap and water, and avoid using harsh chemicals. Store it in a cool, dry place when not in use. Make sure to check the reflective strips regularly to ensure they're still visible for safety on the trail.