Using this Harry Potter drinks bottle is super easy. First, grab one of the 5 ultra - bright marker pens and start coloring your bottle according to your imagination. You can attach the carabiner clip to your backpack for easy carrying. When it comes to cleaning, just use some mild dish soap and warm water. Rinse it thoroughly. Remember to keep the marker pens away from small children as they are for coloring the bottle. Also, don't expose the bottle to extremely high temperatures as it may damage the material. To maintain its appearance, store it in a cool and dry place when not in use.