Using this flask is easy. First, unscrew the wide cap to fill it with water. Then, adjust the soft strap to fit your hand comfortably for a secure grip during your short outings. When you're thirsty, simply take a drink whenever you need. Remember to keep the flask clean by washing it regularly with mild soap and water. Avoid using harsh chemicals as they might damage the flask. After washing, let it dry completely before storing it. Also, don't overfill the flask to prevent spills.