To use this hydration vest, first, fill the 5L reservoir with your favorite drink. Then, adjust the straps to ensure a comfortable and snug fit. You can store small items like energy bars and keys in the versatile storage unit. When using it, make sure the tube is properly connected and unobstructed for easy sipping. After each use, empty the reservoir and let it dry completely to prevent mold. Wash the vest with mild detergent and air - dry it. Avoid using harsh chemicals or putting it in the dryer to maintain its quality.