Using your Corkcicle 20oz Sierra Sport Canteen is a breeze. First, open the leak - proof cap and fill the wide - mouth canteen with your favorite beverage or add some ice cubes. The quick - sip cap allows you to take a drink on the go without any hassle. When you're done using it, simply close the cap tightly. For maintenance, wash the canteen with mild soap and warm water. Don't use abrasive cleaners as they may damage the finish. Also, make sure to dry it thoroughly before storing. Avoid dropping the canteen from a height as it may affect its insulation and structural integrity.