Using this Jansport to - go mug is easy. First, detach the bottom part and put some ice cubes in it. Then re - attach the bottom. You can now fill the mug with your favorite hot or cold drink. When you're done using it, wash it with mild soap and warm water. Avoid using abrasive cleaners as they can scratch the mug. Keep it in a dry place when not in use. Since it's a used item, expect some normal signs of wear like scratches and scuffs.