A reliable pen is a useful tool for jotting down notes, journaling, or filling out forms during your Camino journey. Choose a pen that is lightweight, durable, and comfortable to hold for extended writing. Opt for a pen with a clip to easily attach it to your notebook or pocket for quick access. Consider a pen with smooth ink flow and a fine point for precise writing. Waterproof or all-weather pens can be beneficial in case of rain or humid conditions.