To use this HydraPak SoftFlask WMX 500ml, simply open the wide cap and fill it with your preferred drink, ice, or nutrition mixes. It fits well in wide and short vest and pack pockets, so you can carry it around easily during your activities. When cleaning, use warm soapy water and a bottle brush to ensure all the residues are removed. Make sure to dry it thoroughly before storing. Avoid using harsh chemicals as they may damage the flask. And don't overfill it to prevent spills.